React-native: Windows & Android: react native server crashes very often

[pvllnspk]

 ERROR  EPERM: operation not permitted, lstat '...\.idea\workspace.xml___jb_old___'
{"errno":-4048,"code":"EPERM","syscall":"lstat","path":"...\.idea\\workspace.xml___jb_old___"}
Error: EPERM: operation not permitted, lstat 'app\.idea\workspace.xml___jb_old___'
    at Error (native)

After that I should again do:

npm start

How to resolve this quite annoying problem?
Thanks

[chardlau]

I got the same problem after i modified a js file.
I try modifying project directory‘s access level, grant total access permission to all users, but on work. It seems the packager program 's run time user has no permission. I don't know.
Hope somebody help.

[chardlau]

I solve the problem by install watchman.
The same issues gave the method: https://github.com/facebook/react-native/issues/4204
watchman: https://facebook.github.io/watchman/
download url is: http://bit.ly/watchmanwinalpha
windows is still alpha support, see this: https://github.com/facebook/watchman/issues/19
after extract watchman and set path env, restart idea, the problem do not happend again.

[withparadox2]

@chardlau doesn't solve my problem, I have no idea why just adding watchman to env path can avoid such error

[withparadox2]

I think I find another solution, but not quite sure, help me check it. After crawling files, a watcher will be added on these files, so what if I ignore such files under .idea?

Add one method in local-cli\default.config.js

  getBlacklistREMore(platform, additionalList) {
    return blacklist(platform, additionalList);
  },

Change code of method getPackagerServer In local-cli\server\runServer.js
from
blacklistRE: config.getBlacklistRE(),
to
blacklistRE: config.getBlacklistREMore(null, [/\.idea.*/]),

Done.
Let me know if anything described here is wrong.

[pvllnspk]

Now it cries about build folder
\build\generated\source\r\debug\android\support\design\R.java'
@withparadox2 How to properly handle it?

[withparadox2]

@pvllnspk I have never come cross errors like yours, could you paste the detail message? And need to tell you the truth I got the error again after the server running for several hours, it's still related to 'workspace.xml___jb_old___'.

[pvllnspk]

@withparadox2, so seems like we need to find another solution, let's keep in touch

[pvllnspk]

any news?

[pvllnspk]

https://github.com/facebook/react-native/issues/7174
http://stackoverflow.com/questions/38701115/windows-android-react-native-server-crashes-very-often/38831876#38831876

[Rmaan]

For the record:

• I tried Watchman on Windows without success (It bundles nothing(!) and app won't run. As stated in this ticket https://github.com/facebook/react-native/issues/7022).
• Then tried to disable inspection of my git files (lstat error was almost always on my .git/index.lock) by defining getBlacklistRE in my rn-cli.config.js but it didn't help either.

The only temporarily workaround I found was to change behavior of react cli on exceptions. Open node_modules/react-native/local-cli/server/server.js find process.on('uncaughtException', line and comment process.exit(1); at the end to completely disable quit on exception.

[ericnakagawa]

Hi folks, are you folks still experiencing this issue?

[minhchu]

I didnt experience this issue from RN v0.37 (still crash on 0.36 very often)

[anthony-skr]

Experiencing the same on 0.39.2 with .idea and .git folders

[ericnakagawa]

@pvllnspk @minhchu I'll be closing this issue since it looks like it is resolved since v0.37 and we are now at v0.37

[ptol]

I'll be closing this issue since it looks like it is resolved since v0.37 and we are now at v0.37

The problem still exists with v0.40

[viettranme]

I encounter this issue with v0.40 ONLY when including 'react-native-camera' library.

• Error in the "react-native run-android" console:

`
FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:prepareMobileAppReactNativeCameraUnspecifiedL
  ibrary'.

  Could not expand ZIP 'E:\react-native\MobileApp\node_modules\react-native-c
  amera\android\build\outputs\aar\react-native-camera-release.aar'.

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug
  option to get more log output.

BUILD FAILED

Total time: 4 mins 35.965 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/android-setup.html

(node:3816) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejec
tion id: 2): TypeError: Cannot read property 'message' of undefined
`

• Errror in React Packager console:
  ERROR EPERM: operation not permitted, lstat 'E:\react-native\MobileApp\andr oid\app\build\intermediates\exploded-aar\MobileApp\react-native-camera\unspec ified\aapt\AndroidManifest.xml' {"errno":-4048,"code":"EPERM","syscall":"lstat","path":"E:\\react-native\\MobileApp\\android\\app\\build\\intermediates\\exploded-aar\\MobileApp\\react-na tive-camera\\unspecified\\aapt\\AndroidManifest.xml"} Error: EPERM: operation not permitted, lstat 'E:\react-native\MobileApp\andro id\app\build\intermediates\exploded-aar\MobileApp\react-native-camera\unspeci fied\aapt\AndroidManifest.xml' at Error (native)

[yuwanlin]

The problem still exists with v0.40.
At the time error is occuring, the windows's taskbar will be stop, only restart system.

[prattpratt]

Confirm problem on Windows 7, [email protected]

 ERROR  EPERM: operation not permitted, lstat 'd:\project\project\.git\index.lock'
{"errno":-4048,"code":"EPERM","syscall":"lstat","path":"d:\\project\\project\\.git\\index.lock"}
Error: EPERM: operation not permitted, lstat 'd:\project\project\.git\index.lock'
    at Error (native)

See http://facebook.github.io/react-native/docs/troubleshooting.html
for common problems and solutions.

[wilomgfx]

Same here. Windows 7, [email protected]
On WebStorm.

[prattpratt]

This become really annoying :( I can't work in normal flow.

[user471]

@ericnakagawa I think this issue should be reopened

[wilomgfx]

@ericnakagawa totally should be reopened.

[petersobolev]

Same problem, RN 0.40.0, Win7

[yuwanlin]

I hava solved it. see http://blog.csdn.net/real_bird/article/details/54691589

[Rmaan]

Is this a Windows 7 specific problem? Does anybody experiencing this issue with Windows 10?

[scavezze]

I have the same issue v 0.38 can i just tell that packager to ignore certain folders

[codetony25]

+1 having this issue on React Native 0.39.2

[omerdn1]

Should be reopened, can confirm I'm getting this issue on RN 0.40

[anthony-skr]

react-native --version
react-native-cli: 1.3.0
react-native: 0.40.0

Win7 64

[rajavijayasaradhi]

I'm using Exponent. I'm also facing the same issue.

Error: EPERM: operation not permitted, lstat 'C:\code\REACT NATIVE\dinder\node_modules.staging\native-base-4ddfb251\dist' at Error (native)

[rajavijayasaradhi]

Solution(For Exponent Users) : In the Exponent XDE, there's a restart button. Try that. It will clear your cache, load all files(If you have recently installed any new stuff, in my case I had installed NativeBase framework, it will load that as well )

[BookOfGreg]

Thank you @yuwanlin , your fix to clean project in Android Studio worked for us.

[codebymikey]

This should resolve the issue for now.

In case the answer gets deleted, the solution is to go to File > Settings > System Settings > Synchronization.
And uncheck Use "safe write" (save changes to a temporary file first).

Obviously this isn't a long term solution as it's checked by default for a reason.

[prattpratt]

@codebymikey, yes, seems this solution only works for WebStorm. For people who use VS Code this will not help.

[Dashue]

Windows 10 vscode v1.9.1 here

[Johnson27]

It seems that the solution below works well for WebStorm. Didn't check out other editors.

In Webstorm, uncheck "File->Settings->System Settings->sychronization->use safe write"

[Dashue]

My issue came from having run vscode as an admin which created build folders my own user didn't have permissions on. Manually removed build folders and reset permissions solved it for me.

[malcriad0]

This work for me:
react-native start
And when the load is complete type:
react-native run-android

[devenis]

I've been using VSCode as well and faced the same problem. Since VSCode has no option like "safe write" that Webstorm got, i've set 2 options in the settings file of VSCode editor.

File -> Preferences -> Settings

Added:

"git.autorefresh": false,
"git.autofetch": false,

This seemed to do the trick, i do not know if those options actually prevent the git file of being updated all the time you save changes to your code. I haven't faced the error message since then. Hope it helps someone.

Edit: By the way, as the settings above will deactivate the auto refresh VSCode holds with the Git status, whenever you need to check how many changes were made to the project, you just have to click on the Git button on the editor and it will update its status.

[LearnShare]

On win7, with VSCode and SourceTree, sometimes got that crash.

[bexoss]

Hi, I'm using RN 0.42 (latest), Windows 7 (64), and WebStorm.

I'm also facing similar problem very often.
It seems like problem of permissions.
I got an error when builder trying to create, or delete folder/files.

I already unchecked 'safe write' in WebStorm, but it didn't help for me.
If I try to build 10 times, at least 5 times failed. It is very annoying.
I can't concentrate on developing, how should I do?

[Dashue]

I figured out it was happening once due to having created the files /
folders as an admin. Deleting and creating as current user sorted it.

It also happened when done other process kept a handle to the files /
folders. Maybe try to close your other programs and see if it goes away.

On 16 Mar 2017 8:29 a.m., "bexoss" [e-mail] wrote:

Hi, I'm using Windows 7 (64), and WebStorm.

I'm also facing similar problem very often.
It seems like problem of permissions.
I got an error when builder trying to create, or delete folder/files.

I already unchecked 'safe write' in WebStorm, but it didn't help for me.
If I try to build 10 times, at least 5 times failed. It is very annoying.
I can't concentrate on developing, how should I do?

[image: 1111]
https://cloud.githubusercontent.com/assets/12633102/23987666/048cc084-0a6e-11e7-8ddb-93f1c1daf7fb.png

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[deejayxd07]

still getting this error on v0.41.2

[woosungchu]

Same error

C:\react-native-practice>react-native --version
react-native-cli: 2.0.1
react-native: 0.42.3

[yygmind]

Thanks @codebymikey ,
It works well for me through the solution,
In Webstorm, uncheck "File->Settings->System Settings->sychronization->use safe write"
I'm Win10, use Webstorm

[jasan-s]

on react-native 0.42 on windows 7 x64 using sublimeText. What is the accepted solution?

[llioor]

Same problem here...
This is the output of React Packager..

Loading dependency graph, done.
 ERROR  EPERM: operation not permitted, lstat 'C:\wamp\www\nativetest\node_modul
es\react-native-fbsdk\android\src\main\res\values\strings.xml'
{"errno":-4048,"code":"EPERM","syscall":"lstat","path":"C:\\wamp\\www\\nativetes
t\\node_modules\\react-native-fbsdk\\android\\src\\main\\res\\values\\strings.xm
l"}
Error: EPERM: operation not permitted, lstat 'C:\wamp\www\nativetest\node_module
s\react-native-fbsdk\android\src\main\res\values\strings.xml'
    at Error (native)

[st0ffern]

Whenever Android Studio starts gradle sync or to process files in the appdir. the watchdog on react-native will die with this error.
Try to start simulator from console or start simulator from Android studio, then run react-native run-android close android studio and develop...

[llioor]

Hey @stoffern
My simulator is avd... I'm working with phpStorm so I'm working with the console over there:
Run android avd which open AVD manager with a list of devices and I start one of the devices.
When the device is ready I run in the phpStorm react-native run-android which start to load all packages and then I see the error.
I understood what you wrote but I don't understand how to implement it in my environment. Can you advice please?

When I run the commend "react-native run-android" I got this:

:app:generateDebugSources UP-TO-DATE      
:app:processDebugJavaRes UP-TO-DATE      
:app:compileDebugJavaWithJavac                 
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:7: error: package com.facebook.reactnative.androidsdk does not exist
import com.facebook.reactnative.androidsdk.FBSDKPackage;
                                          ^    
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:9: error: cannot find symbol
import com.facebook.CallbackManager;           
                   ^                           
  symbol:   class CallbackManager              
  location: package com.facebook               
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:10: error: cannot find symbol
import com.facebook.FacebookSdk;               
                   ^                           
  symbol:   class FacebookSdk                  
  location: package com.facebook               
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:11: error: package com.facebook.appevents does not exist
import com.facebook.appevents.AppEventsLogger; 
                             ^                 
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:27: error: cannot find symbol
  private static CallbackManager mCallbackManager = CallbackManager.Factory.create();
                 ^                             
  symbol:   class CallbackManager              
  location: class MainApplication              
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:29: error: cannot find symbol
  protected static CallbackManager getCallbackManager() {
                   ^                           
  symbol:   class CallbackManager              
  location: class MainApplication              
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:27: error: package CallbackManager does not exist
  private static CallbackManager mCallbackManager = CallbackManager.Factory.create();
                                                                   ^
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:43: error: cannot find symbol
            new FBSDKPackage(),                
                ^                              
  symbol: class FBSDKPackage                   
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:44: error: cannot find symbol
            new FBSDKPackage(),                
                ^                              
  symbol: class FBSDKPackage                   
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:48: error: cannot find symbol
            new FBSDKPackage(mCallbackManager) 
                ^                              
  symbol: class FBSDKPackage                   
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:61: error: cannot find symbol
    FacebookSdk.sdkInitialize(getApplicationContext());
    ^                                          
  symbol:   variable FacebookSdk               
  location: class MainApplication              
C:\wamp\www\nativetest\android\app\src\main\java\com\nativetest\MainApplication.java:63: error: cannot find symbol
    AppEventsLogger.activateApp(this);         
    ^                                          
  symbol:   variable AppEventsLogger           
  location: class MainApplication              
12 errors                                      
:app:compileDebugJavaWithJavac FAILED          

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:        
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED  

Total time: 17.866 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/android-setup.html

I went through the getting start on the fackbook SDK and I did all in the right way.
I noticed that in my node_modules I have only "reactnative" folder under react-native-fbsdk > android > src > main > java >com >facebook
Is it ok?
What else can be the problem?

Thank you

[st0ffern]

error: package com.facebook.reactnative.androidsdk does not exist

install android SDK...
https://facebook.github.io/react-native/docs/getting-started.html#3-install-the-android-6-0-marshmallow-sdk

BTW Have you followed the instructions by details?

This is stackoverflow.. not a issue with react-native

[llioor]

I already installed Android sdk.
With a clean project I can run the app on my avd emulator.
The problem starts only when I install the fbsdk and setting it up.

[llioor]

Solution found:
http://stackoverflow.com/a/43217182/2862728

[rockynox]

I have a feeling that it's a conflict between the server and the build android which try to access same files. Indeed in Webstorm they are both launch simultaneously and since I installed new react-module (react-native-fcm/react-native-fabric) it creates this permission conflict.

Two solution worked for me :

- gradlew clean (with "cd android && gradlew clean" as @llioor said)
- Then normal run config (start and run-android at the same time)

or

- react-native start
*Wait for it to be completely up*
- react-native run-android 

[43081j]

This still happens for me...

> react-native --version
react-native-cli: 2.0.1
react-native: 0.43.3

In procmon, I see a huge amount of file operations with status "BUFFER OVERFLOW", could be related? I forgot buffer overflows are just buffer length checks...

Seems when anything that _isn't_ the packager tries to access the same files, the packager throws a fit. It won't run again until I remove my node_modules and re-install (yarn). So my guess is something bad going on with open file handles, etc...

Also do note, I use vim and CLI, so you can rule out any editor/android studio/etc I guess.

Almost always, too, the lstat errors are on .git paths and node_modules/.bin paths.

This issue _really_ shouldn't be closed, I suggest you re-open it @ericnakagawa.

[Dashue]

After running the packager manually outside of vscode, and attaching to it
for debugging, everything is way faster and I no longer hit any issues.
Give it a try?

On 17 Apr 2017 11:52 a.m., "James Garbutt" [e-mail] wrote:

This still happens for me...

react-native --version
react-native-cli: 2.0.1
react-native: 0.43.3

In procmon, I see a huge amount of file operations with status "BUFFER
OVERFLOW", could be related?

Seems when anything that isn't the packager tries to access the same
files, the packager throws a fit. It won't run again until I remove my
node_modules and re-install (yarn). So my guess is something bad going on
with open file handles, etc...

Almost always, too, the lstat errors are on .git paths and
node_modules/.bin paths.

This issue really shouldn't be closed, I suggest you re-open it
@ericnakagawa https://github.com/ericnakagawa.

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[43081j]

Right now I'm pretty much running it all outside any editor and have always been:

• Run emulator -avd API_23 (my AVD i setup)
• Run react-native start (works first time)
• Run react-native run-android (this launches start if it isn't already running, too)
• Either install a new dependency (yarn add foo), or do some git operations (e.g. commit something)

Result is an unknown lstat error (code -4094).

I've stepped through the packager and broke on the exception, but its literally just an lstat error, no useful information.

Re-running the packager after it has errored results in the same error (sometimes on a different path). So at this point it no longer functions at all.

The only solution I found is to trash the entire node_modules directory and re-install it all, presumably because the mass of file handles it has open get freed... (its monitoring node_modules by the looks of it, thats potentially a huge tree).

Also sounds like the solution way up above, of running a clean build in android studio, is solving the problem the same way my node_modules deletion is? Basically if you delete a load of files the packager was watching, it works. Sounds like too many watches to me...

[codebymikey]

Expanding on @withparadox2 solution:

This solved the issue for me on:
react-native-cli: 2.0.1
react-native: 0.35.0

Create the following rn-cli.config.js file in your project's root directory containing something similar to this (change as you see fit):

let blacklist = require('react-native/packager/blacklist');
let config = {
    getBlacklistRE(platform) {
        return blacklist(platform, [
            // Ignore local `.sample.js` files.
            /.*\.sample\.js$/,

            // Ignore IntelliJ directories
            /.*\.idea\/.*/,
            // ignore git directories
            /.*\.git\/.*/,
            // Ignore android directories
            /.*\/app\/build\/.*/,

            // Add more regexes here for paths which should be blacklisted from the packager.
        ]);
    }
};
module.exports = config;

[dcp12345678]

I had this problem as well after upgrading to react-native 0.43.4 using react-native-git-upgrade. I use Visual Studio Code on Windows 7 and run on the Android Emulator that comes with Android Studio. Here is the solution that worked for me:

1. Close any running instances of android emulator and react packager.
2. Under /android, remove the build folder and all its contents.
3. Under /android/app, remove the build folder and all its contents
4. Go back to your project folder and do 'react-native run-android', and with any luck, your project will run.

[pierre-H]

I have the same problem.

I use VS Code 1.11.2, Windows 7 and create-react-native-app.
The problem started since I did git init.

Any solution ?
@ericnakagawa this issue should be re-opened

[llioor]

@pierre-H check my solution up.

[pierre-H]

@llioor There is no android folder with creact-react-native-app

[llioor]

@pierre-H
If you are working with create native app so open issue on their git repo because it is not related to the same issue.. the current issue is realted to the "build" folder and you are not working with build folder until you are not "eject" from "create react native app".

If you want, go through these steps: https://facebook.github.io/react-native/docs/getting-started.html and if you have the same issue as mentioned in the first comment here so check my solution.

[fgeorgsson]

On every build I get the same problem. The packager crashes since it is watching files that are deleted or modified during build.

Typical error:

ERROR  ENOENT: no such file or directory, scandir 'C:\projects\foo\android\app\build\intermediates\res\merged\bar\release\values-xlarge-v4'
{"errno":-4058,"code":"ENOENT","syscall":"scandir","path":"C:\\projects\\foo\\android\\app\\build\\intermediates\\res\\merged\\bar\\release\\values-xlarge-v4"}
Error: ENOENT: no such file or directory, scandir 'C:\projects\foo\android\app\build\intermediates\res\merged\bar\release\values-xlarge-v4'

The actual file it crashes on varies, but always in the android\app\build folder.

I tried the suggestion to add a rn-cli.config.js file like earlier in the thread, specifically telling it to ignore android/app, but that makes no difference.

Windows 10
react-native-cli: 2.0.1
react-native: 0.43.4

[llioor]

@pcguru did you read all comments in this post?
Solution found:
http://stackoverflow.com/a/43217182/2862728

[fgeorgsson]

We're not using react-native-fbsdk.

The packager shouldn't be monitoring the build folder.

[Venryx]

@pcguru Newer versions of react-native apparently use a different signature for blacklisting -- you're supposed to no longer include the "platform" parameter.

So @codebymikey's solution here should work, except instead of:

[...]
    getBlacklistRE(platform) {
        return blacklist(platform, [
            [...]
        ]);
    }
[...]

It should now be:

[...]
    getBlacklistRE() {
        return blacklist([
            [...]
        ]);
    }
[...]

For reference, see here and here.

For me, with:
react-native-cli: 2.0.1
react-native: 0.42.0-rc.3

This finally worked! Solved the agonizing, horrible process of deleting the entire build folder every time I wanted to change anything in the Java code.

Really, the blacklist function should throw an error or something, if it has an extra parameter... would save some headaches for people following outdated blacklisting code. (it currently just fails completely silently)

EDIT: Actually, this didn't solve it. See below for a working solution.

[Venryx]

I've found a second solution.

1) Move your index.android.js entry file into the src folder.
2) Update your android/app/build.gradle file:

project.ext.react = [
    // the entry file for bundle generation
-    entryFile: "index.android.js",
+    entryFile: "src/index.android.js",
    extraPackagerArgs: ["--sourcemap-output", file("$buildDir/outputs/index.android.js.map")],
];

3) Update your android\app\src\main\java\v\<project name>\MainApplication.java file:

    private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
        @Override
        protected String getJSMainModuleName() {
-            return "index.android";
+            return "src/index.android";
        }

4) Create an rn-cli.config.js file in your project's root, with these contents:

var path = require("path");
let config = {
    getProjectRoots() {
        return [path.resolve("node_modules"), path.resolve("src")];
    },
};
module.exports = config;

What this does is it removes the need for the blacklist -- it just doesn't even start processing anything other than what's in "src" and "node_modules". This means, when you build your project, the file-changes in "android" are not even on the radar. (Of course, if you make Java/Android changes within the "node_modules" folder and build them, the packager may crash. But this is not very common, so it's okay.)

So why does this work, but not the "ignore list"? I think it's because the file-watcher system does some operations even on "ignored" paths -- it doesn't do the full processing, but still calls "lstat" on the files. (In my project, paths which were ignored, and confirmed as such with custom code in various places in react-native's js files, still showed up in errors for an "lstat" operation in the packager process -- unfortunately, the stack trace just said "Error (native)" or something. Of course, the ignore-not-fully-ignoring might also just be a side-effect of the non-normalized-paths-causing-duplicate-entries issue mentioned in my previous post.)

So anyway, if the above solution of using watchman doesn't work, you can try this one as well. (I'm currently going with the watchman solution, however, since I've read that it's somewhat faster)

Phew! Anyway, hope I can finally close the book on this one...

[Aroniez]

Still same problem in Win 7 with the following versions
react-native-cli: 2.0.1
react-native: 0.44.2

[ashikjs]

I Gave a Answer hare
And
I Got Solution from this Link

[facosta0787]

Hello, I had the same problem on windows 10 , I could fix it following the next steps:
Run one by one
1. go to folder android into your project and run gradlew clean.

2. return to root folder of your project and run react-native start. wait until React Packager is ready and says: "loading dependency graph, done".

3. now run react-native run-android.

If all is right you project should run in your Emulator whitout problems.

I hope works for you as It works for me.

[hiteshsahu]

Turned off Atom (editor) and Android Studio and tried again, Worked like a charm. Probably Android Studio indexing is interfering with npm.

[mallelapavank]

@hiteshsahu This worked in my case. I closed both Android Studio and Atom, then ran react-native run-android. Build was successful with no errors

[Venryx]

I've written a new Stack Overflow answer which sums up and extends a bit on the solution(s) presented above: https://stackoverflow.com/a/47420765/2441655

It doesn't require the developer to close the react-native packager or Android Studio, or call "gradlew clean"; which is nice, since those workarounds are annoying and eat away at your sanity.

My earlier posts (a couple pages up) are less clear because at the time I didn't understand the distinction between the two issues. (That, and there was a third issue in the "jest" module which made one of those two issues much harder to diagnose/debug -- the third issue is fixed now if you're using the latest versions, so doesn't need to be worked around anymore)

[ddaeschler]

This is still happening on RN 0.45.1 (at least on windows), and from all the comments it looks like a race condition against the filesystem. I think if lstat() fails and the file doesn't exist, it should simply not be considered an error.

These kinds of problems are really common when dealing with a filesystem outside of the control of the application. Almost nothing should be assumed about the filesystem structure from one second to the next.

Can I help somehow? Is there someone still working on a fix for this?

[fatfatson]

https://facebook.github.io/watchman/docs/config.html

On Linux systems, ignore_dirs is respected at the OS level; the kernel simply will not tell watchman about changes to ignored dirs. macOS and Windows have limited or no support for this, so watchman needs to process and ignore this class of change.

i think that's why .watchmanconfig.ignore_dirs=["android"] not work!

[fatfatson]

now the rn-cli.config.js become these:

let blacklist = require('metro-bundler/src/blacklist');

let config = {
    getBlacklistRE() {
        return blacklist([
            // Ignore local `.sample.js` files.
            /.*\.sample\.js$/,

            // Ignore IntelliJ directories
            /.*\.idea\/.*/,
            // ignore git directories
            /.*\.git\/.*/,
            // Ignore android directories
            /.*\/app\/build\/.*/

            // Add more regexes here for paths which should be blacklisted from the packager.
        ]);
    }
};
module.exports = config;

i have tried in :
win10
react-native-cli: 2.0.1
react-native: 0.50.4

now the dev server won't be interupted by "lstat err" due to the rebuild process of android app