React-native-firebase: Error in application initialization - [Firebase/Core][I-COR000003] The default Firebase app has not yet been configured

[aurelienmartin]

Issue

Hello,

I followed all the steps to install the library on React-Native but unable to complete the configuration of the project on the site https://console.firebase.google.com

The following error appears in the console: [Firebase / Core] [I-COR000003] The default Firebase app has not yet been configured. Add [FIRApp configure]; (FirebaseApp.configure () in Swift) to your application initialization. Read more: https://goo.gl/ctyzm8.

I followed the guide to put the GoogleService file but the error persists. Is this a problem in the latest version of React Native Firebase ?

Thanks ! Aurélien

---

Project Files

Javascript

Click To Expand

#### `package.json`:

# N/A

#### `firebase.json` for react-native-firebase v6:

# N/A

### iOS

Click To Expand

#### `ios/Podfile`: - [ ] I'm not using Pods - [x] I'm using Pods and my Podfile looks like:

platform :ios, '9.0'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'

def add_flipper_pods!(versions = {})
  versions['Flipper'] ||= '~> 0.33.1'
  versions['DoubleConversion'] ||= '1.1.7'
  versions['Flipper-Folly'] ||= '~> 2.1'
  versions['Flipper-Glog'] ||= '0.3.6'
  versions['Flipper-PeerTalk'] ||= '~> 0.0.4'
  versions['Flipper-RSocket'] ||= '~> 1.0'

  pod 'FlipperKit', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitLayoutPlugin', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/SKIOSNetworkPlugin', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitUserDefaultsPlugin', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitReactPlugin', versions['Flipper'], :configuration => 'Debug'

  # List all transitive dependencies for FlipperKit pods
  # to avoid them being linked in Release builds
  pod 'Flipper', versions['Flipper'], :configuration => 'Debug'
  pod 'Flipper-DoubleConversion', versions['DoubleConversion'], :configuration => 'Debug'
  pod 'Flipper-Folly', versions['Flipper-Folly'], :configuration => 'Debug'
  pod 'Flipper-Glog', versions['Flipper-Glog'], :configuration => 'Debug'
  pod 'Flipper-PeerTalk', versions['Flipper-PeerTalk'], :configuration => 'Debug'
  pod 'Flipper-RSocket', versions['Flipper-RSocket'], :configuration => 'Debug'
  pod 'FlipperKit/Core', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/CppBridge', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FBCxxFollyDynamicConvert', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FBDefines', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FKPortForwarding', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitHighlightOverlay', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitLayoutTextSearchable', versions['Flipper'], :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitNetworkPlugin', versions['Flipper'], :configuration => 'Debug'
end

# Post Install processing for Flipper
def flipper_post_install(installer)
  installer.pods_project.targets.each do |target|
    if target.name == 'YogaKit'
      target.build_configurations.each do |config|
        config.build_settings['SWIFT_VERSION'] = '4.1'
      end
    end
  end
end

target 'Again' do
  # Pods for Again
  pod 'FBLazyVector', :path => "../node_modules/react-native/Libraries/FBLazyVector"
  pod 'FBReactNativeSpec', :path => "../node_modules/react-native/Libraries/FBReactNativeSpec"
  pod 'RCTRequired', :path => "../node_modules/react-native/Libraries/RCTRequired"
  pod 'RCTTypeSafety', :path => "../node_modules/react-native/Libraries/TypeSafety"
  pod 'React', :path => '../node_modules/react-native/'
  pod 'React-Core', :path => '../node_modules/react-native/'
  pod 'React-CoreModules', :path => '../node_modules/react-native/React/CoreModules'
  pod 'React-Core/DevSupport', :path => '../node_modules/react-native/'
  pod 'React-RCTActionSheet', :path => '../node_modules/react-native/Libraries/ActionSheetIOS'
  pod 'React-RCTAnimation', :path => '../node_modules/react-native/Libraries/NativeAnimation'
  pod 'React-RCTBlob', :path => '../node_modules/react-native/Libraries/Blob'
  pod 'React-RCTImage', :path => '../node_modules/react-native/Libraries/Image'
  pod 'React-RCTLinking', :path => '../node_modules/react-native/Libraries/LinkingIOS'
  pod 'React-RCTNetwork', :path => '../node_modules/react-native/Libraries/Network'
  pod 'React-RCTSettings', :path => '../node_modules/react-native/Libraries/Settings'
  pod 'React-RCTText', :path => '../node_modules/react-native/Libraries/Text'
  pod 'React-RCTVibration', :path => '../node_modules/react-native/Libraries/Vibration'
  pod 'React-Core/RCTWebSocket', :path => '../node_modules/react-native/'

  pod 'React-cxxreact', :path => '../node_modules/react-native/ReactCommon/cxxreact'
  pod 'React-jsi', :path => '../node_modules/react-native/ReactCommon/jsi'
  pod 'React-jsiexecutor', :path => '../node_modules/react-native/ReactCommon/jsiexecutor'
  pod 'React-jsinspector', :path => '../node_modules/react-native/ReactCommon/jsinspector'
  pod 'ReactCommon/callinvoker', :path => "../node_modules/react-native/ReactCommon"
  pod 'ReactCommon/turbomodule/core', :path => "../node_modules/react-native/ReactCommon"
  pod 'Yoga', :path => '../node_modules/react-native/ReactCommon/yoga', :modular_headers => true

  pod 'DoubleConversion', :podspec => '../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec'
  pod 'glog', :podspec => '../node_modules/react-native/third-party-podspecs/glog.podspec'
  pod 'Folly', :podspec => '../node_modules/react-native/third-party-podspecs/Folly.podspec'

  target 'AgainTests' do
    inherit! :complete
    # Pods for testing
  end

  use_native_modules!

  # Enables Flipper.
  #
  # Note that if you have use_frameworks! enabled, Flipper will not work and
  # you should disable these next few lines.
  add_flipper_pods!
  post_install do |installer|
    flipper_post_install(installer)
  end
end

target 'Again-tvOS' do
  # Pods for Again-tvOS

  target 'Again-tvOSTests' do
    inherit! :search_paths
    # Pods for testing
  end
end

#### `AppDelegate.m`:

#import "AppDelegate.h"

#import <Firebase.h>
#import <React/RCTBridge.h>
#import <React/RCTBundleURLProvider.h>
#import <React/RCTRootView.h>

#if DEBUG
#import <FlipperKit/FlipperClient.h>
#import <FlipperKitLayoutPlugin/FlipperKitLayoutPlugin.h>
#import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h>
#import <FlipperKitNetworkPlugin/FlipperKitNetworkPlugin.h>
#import <SKIOSNetworkPlugin/SKIOSNetworkAdapter.h>
#import <FlipperKitReactPlugin/FlipperKitReactPlugin.h>

static void InitializeFlipper(UIApplication *application) {
  FlipperClient *client = [FlipperClient sharedClient];
  SKDescriptorMapper *layoutDescriptorMapper = [[SKDescriptorMapper alloc] initWithDefaults];
  [client addPlugin:[[FlipperKitLayoutPlugin alloc] initWithRootNode:application withDescriptorMapper:layoutDescriptorMapper]];
  [client addPlugin:[[FKUserDefaultsPlugin alloc] initWithSuiteName:nil]];
  [client addPlugin:[FlipperKitReactPlugin new]];
  [client addPlugin:[[FlipperKitNetworkPlugin alloc] initWithNetworkAdapter:[SKIOSNetworkAdapter new]]];
  [client start];
}
#endif

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  if ([FIRApp defaultApp] == nil) {
    [FIRApp configure];
  }
#if DEBUG
  InitializeFlipper(application);
#endif

  RCTBridge *bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];
  RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge
                                                   moduleName:@"Again"
                                            initialProperties:nil];

  rootView.backgroundColor = [[UIColor alloc] initWithRed:1.0f green:1.0f blue:1.0f alpha:1];

  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
  UIViewController *rootViewController = [UIViewController new];
  rootViewController.view = rootView;
  self.window.rootViewController = rootViewController;
  [self.window makeKeyAndVisible];
  return YES;
}

- (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
{
#if DEBUG
  return [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];
#else
  return [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
#endif
}

@end

---

Android

Click To Expand

#### Have you converted to AndroidX? - [ ] my application is an AndroidX application? - [ ] I am using `android/gradle.settings` `jetifier=true` for Android compatibility? - [ ] I am using the NPM package `jetifier` for react-native compatibility? #### `android/build.gradle`:

// N/A

#### `android/app/build.gradle`:

// N/A

#### `android/settings.gradle`:

// N/A

#### `MainApplication.java`:

// N/A

#### `AndroidManifest.xml`:

<!-- N/A -->

---

Environment

Click To Expand

**`react-native info` output:**

2020-05-25 17:58:54.260396+0200 Again[6295:683862] 6.25.0 - [Firebase/Core][I-COR000003] The default Firebase app has not yet been configured. Add `[FIRApp configure];` (`FirebaseApp.configure()` in Swift) to your application initialization. Read more: https://goo.gl/ctyzm8.
flipper: FlipperClient::addPlugin Inspector
flipper: FlipperClient::addPlugin Preferences
flipper: FlipperClient::addPlugin React
flipper: FlipperClient::addPlugin Network
flipper: FlipperClient::onConnected

- **Platform that you're experiencing the issue on**: - [ ] iOS - [ ] Android - [x] **iOS** but have not tested behavior on Android - [ ] **Android** but have not tested behavior on iOS - [ ] Both - **`react-native-firebase` version you're using that has this issue:** - `7.1.0` - **`Firebase` module(s) you're using that has the issue:** - `react-native-firebase/auth` - **Are you using `TypeScript`?** - `N`

---

• 👉 Check out React Native Firebase and Invertase on Twitter for updates on the library.

[mikehardy]

Something must have been missed. So many ways to do it wrong, very hard to say what was missed. Instead I will point to a script you can read that does it step by step - see if you can compare with your project to find whatever is missing: https://github.com/mikehardy/rnfbdemo/blob/master/make-demo-v6.sh

[ghasemikasra39]

Dear @aurelienmartin.
You may have issue. Firebase products give you this error, when you try to run your app on a Android/ios simulator/emulator, or even on real device connected with a cable, but again in dev mode. try to create a standalone apk/ipa app and install the app on your phone. See if the issue persists.

[ghasemikasra39]

Dear @mikehardy
As @aurelienmartin mentoioned, I have a similar issue. I was not sure if I need to open a separate issue/ feature request for it.

I am using Firebase Crashlytics. Everything works fine on standalone app. However, during development, as soon as I have import crashlytics from '@react-native-firebase/crashlytics'; in my code, I get Error: No Firebase App '[DEFAULT]' has been created - call firebase.initializeApp() error . I have to comment out all my firebase imports to get rid of this error, which is a headache.
I tired:

let crashlytics;
if (!__DEV__) {
  crashlytics = require('@react-native-firebase/crashlytics');
}

But the trick above did not work. With this trick, I did not get the error anymore. However the Crashlytics functionality stopped working on standalone apk.

I see this issue as a feature request.

[cool-debug]

Having the same issue as @ghasemikasra39, not @aurelienmartin. Any solution ?

[aurelienmartin]

Dear @aurelienmartin.
You may have issue. Firebase products give you this error, when you try to run your app on a Android/ios simulator/emulator, or even on real device connected with a cable, but again in dev mode. try to create a standalone apk/ipa app and install the app on your phone. See if the issue persists.

Thank you for taking the time to share your experience. I tried to complete the validation process of the application with the Firebase console after having made an ipa build and executed on my iPhone but the last step of verification with the Firebase servers is still pending.

[mikehardy]

@ghasemikasra39 this is not expected behavior.

Step 1 is a minimal reproducible example. Maintainers aren't seeing this behavior, so we don't know.

Here is the start of creating a throwaway react-native-firebase app: https://github.com/mikehardy/rnfbdemo/blob/master/make-demo-v6.sh

Clone that repo. Run that script. Provide it the firebase init files (plist / json) for a throwaway project you make in your firebase console so you can play freely.

Reproduce the behavior with a simple change to the App.js, and we can see what's going on.

I can't reproduce it though, when I run that script it makes an app that says Crashlytics is available 🤷

[cloudratha]

I struggled with this for ages and not sure if my solution is correct.

I had only installed @react-native-firebase/app, and assumed that was enough to get the verification passed, which wouldn't happen.

I then installed @react-native-firebase/analytics which then passed the verification (from the simulator).

However in my logs I was still getting Firebase is not configured. So I just removed the if ([FIRApp defaultApp] == nil) { if statement from AppDelegate.m and just called [FIRApp configure]; directly (as per Firebase's installation recommendation).

[yoshifumi4423]

@cloudratha
I have same situation like this 6.25.0 - [Firebase/Core][I-COR000003] The default Firebase app has not yet been configured. Add `[FIRApp configure];` (`FirebaseApp.configure()` in Swift) to your application initialization. Read more: https://goo.gl/ctyzm8., although my app still works.
I don't know I can ignore this warning message since my app is working.

Once I remove if, the warning message was gone.

However in my logs I was still getting Firebase is not configured. So I just removed the if ([FIRApp defaultApp] == nil) { if statement from AppDelegate.m and just called [FIRApp configure]; directly (as per Firebase's installation recommendation).

If didFinishLaunchingWithOptions in AppDelegate.m is called multiple times in app, deleting if is not good to solve this warning message.

[cloudratha]

@yoshifumi4423 if you are worried about removing the if statement. Keep it. The first time it’s called the error will appear. Then once configured it should be ok. The message is actually a log but just carries a heavy message that seems negative.

[russellwheatley]

As @mikehardy mentioned, this will be erroneous setup on your part and is not a React Native Firebase bug.

[kalmahik]

I struggled with this for ages and not sure if my solution is correct.

I had only installed @react-native-firebase/app, and assumed that was enough to get the verification passed, which wouldn't happen.

I then installed @react-native-firebase/analytics which then passed the verification (from the simulator).

However in my logs I was still getting Firebase is not configured. So I just removed the if ([FIRApp defaultApp] == nil) { if statement from AppDelegate.m and just called [FIRApp configure]; directly (as per Firebase's installation recommendation).

You saved my day. But also I'd like to add:

  [FIRApp configure];
  [RNSplashScreen show];
  return YES;

I'm using Splascreen, and have to add it after the firebase config

[mikehardy]

@kalmahik do not under any circumstances use 'RNSplashScreen'

see https://github.com/crazycodeboy/react-native-splash-screen/issues/289#issuecomment-502406454

Convert to https://github.com/zoontek/react-native-bootsplash
It is maintained and does not have issues like the unmaintained react-native-splash-screen library
It even has a nifty command line tool to integrate it so migrating is easy https://github.com/zoontek/react-native-bootsplash#assets-generation

[kalmahik]

@kalmahik do not under any circumstances use 'RNSplashScreen'

see crazycodeboy/react-native-splash-screen#289 (comment)

Convert to https://github.com/zoontek/react-native-bootsplash
It is maintained and does not have issues like the unmaintained react-native-splash-screen library
It even has a nifty command line tool to integrate it so migrating is easy https://github.com/zoontek/react-native-bootsplash#assets-generation

thx man seems that I have to migrate from RNSplashScreen to bootsplash