Yarn: Yarn create fails on Windows with "spawn UNKNOWN"

[guigrpa]

Do you want to request a feature or report a bug?

Bug

What is the current behavior?

Running yarn create with create-react-app or with the tool I'm building (create-monorepo) fails, throwing a spawn UNKNOWN error (more details below).

If the current behavior is a bug, please provide the steps to reproduce.

$ yarn create react-app example-app
yarn create v0.24.6
warning No license field
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Installed "[email protected]" with binaries:
      - create-react-app
warning No license field
error An unexpected error occurred: "spawn UNKNOWN".
info If you think this is a bug, please open a bug report with the information provided in "C:\\Users\\ggrau\\AppData\\Local\\Yarn\\config\\global\\yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/create for documentation about this command.

Global installation of create-react-app actually succeeds, since running create-react-app example-app actually succeeds, but not with yarn create.

The same error occurs with yarn create monorepo.

What is the expected behavior?

Error should not be thrown, and the create-react-app script should be launched.

Please mention your node.js, yarn and operating system version.

Node v7.10.0
yarn 0.24.6
Windows 7 SP1

The problem also occurs on the same PC running Node v7.4.0, and on another PC running Node v7.9.0. It does not occur on macOS Sierra (10.12), Node 7.8.0.

[guigrpa]

Actually, I'm a bit confused. Yarn's latest stable release seems to be 0.24.6 (the one I have installed via .msi installer), the online docs include yarn create, there's even a blog post covering this feature, and yarn create seems to do something, but the release notes for 0.25.0 are the ones including yarn create as a new feature...

[vinodronold]

I am also getting this error:
C:\EX>yarn create react-app FFREACTIPY yarn create v0.24.6 warning No license field [1/4] Resolving packages... [2/4] Fetching packages... [3/4] Linking dependencies... [4/4] Building fresh packages... success Installed "[email protected]" with binaries: - create-react-app warning No license field error An unexpected error occurred: "spawn UNKNOWN". info If you think this is a bug, please open a bug report with the information provided in "C:\\Users\\vinod\\AppData\\Local\\Yarn\\config\\global\\yarn-error.log". info Visit https://yarnpkg.com/en/docs/cli/create for documentation about this command.

Yarn version:
0.24.6
Node version:
8.0.0
Platform:
win32 x64
Trace:
Error: spawn UNKNOWN at exports._errnoException (util.js:1026:11) at ChildProcess.spawn (internal/child_process.js:317:11) at Object.exports.spawn (child_process.js:471:9) at Promise (C:\app\vinod\nodejs\node_modules\yarn\lib\util\child.js:53:24) at Promise (<anonymous>) at queue.push (C:\app\vinod\nodejs\node_modules\yarn\lib\util\child.js:52:54) at run (C:\app\vinod\nodejs\node_modules\yarn\lib\util\blocking-queue.js:102:7) at BlockingQueue.maybePushConcurrencyQueue (C:\app\vinod\nodejs\node_modules\yarn\lib\util\blocking-queue.js:117:7) at BlockingQueue.shift (C:\app\vinod\nodejs\node_modules\yarn\lib\util\blocking-queue.js:112:10) at Promise (C:\app\vinod\nodejs\node_modules\yarn\lib\util\blocking-queue.js:62:14)

[vinodronold]

@guigrpa even I tried [email protected]
I am getting the same error, may be something to do with windows. I used npm to install yarn globally.

````
C:appvinodEXpractice>yarn create react-app my_app
yarn create v0.25.4
warning No license field
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Installed "[email protected]" with binaries:
- create-react-app
warning No license field
error An unexpected error occurred: "spawn UNKNOWN".
info If you think this is a bug, please open a bug report with the information provided in "C:\Users\vinod\AppData\Local\Yarn\config\global\yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/create for documentation about this command.

C:appvinodEXpractice>
````

[Nickman87]

Same issue here. Running create-react-app manually after the error does work so it seems to be an actual yarn issue.

[VadimKhoroshiltsev]

I am getting the same error on Windows 10 with node 8.0.0 and yarn version 0.24.5

[Cathy93]

I am getting the same error on Windows 10 with node 7.9.0 and yarn version 0.24.5

[zer0link]

Same error:
Windows 10
node v8.1.3
yarn v0.27.5

[soorajgusain]

It is still not resolved. Please fix it.

yarn create v0.27.5
warning package.json: No license field
warning No license field
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Installed "[email protected]" with binaries:
- create-react-app
warning No license field
error An unexpected error occurred: "spawn UNKNOWN".
info
If you think this is a bug, please open a bug report with the information provided in "C:\Users\MY-PC\AppData\Local\Yarn\config\global\yarn-error.log".
info
Visit https://yarnpkg.com/en/docs/cli/create for documentation about this command.

I also checked the Yarn log. It shows this at the end of error-log file.

yallist@^2.1.2:
version "2.1.2"
resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"

Trace:
Error: spawn UNKNOWN
at exports._errnoException (util.js:1024:11)
at ChildProcess.spawn (internal/child_process.js:325:11)
at Object.exports.spawn (child_process.js:493:9)
at Promise (C:UsersSURAJAppDataRoamingnpmnode_modulesyarnlibutilchild.js:53:24)
at Promise ()
at queue.push (C:UsersSURAJAppDataRoamingnpmnode_modulesyarnlibutilchild.js:52:54)
at run (C:UsersSURAJAppDataRoamingnpmnode_modulesyarnlibutilblocking-queue.js:102:7)
at BlockingQueue.maybePushConcurrencyQueue (C:UsersSURAJAppDataRoamingnpmnode_modulesyarnlibutilblocking-queue.js:117:7)
at BlockingQueue.shift (C:UsersSURAJAppDataRoamingnpmnode_modulesyarnlibutilblocking-queue.js:112:10)
at Promise (C:UsersSURAJAppDataRoamingnpmnode_modulesyarnlibutilblocking-queue.js:62:14)

[BYK]

@soorajgusain I don't have this error on the latest master but we have https://github.com/yarnpkg/yarn/issues/4164 on the first run which we are hoping to fix soon.

If you want it sooner, you are welcome to submit a PR which would be greatly appreciated :)

[malagon91]

It is still not resolved. please fix it.
I getting this error right now:

C:MMReact>yarn create react-app redux-course
yarn create v0.27.5
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Installed "[email protected]" with binaries:
- create-react-app
error An unexpected error occurred: "spawn UNKNOWN".
info If you think this is a bug, please open a bug report with the information provided in "C:\Users\USER1\AppData\Local\Yarn\config\global\yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/create for documentation about this command.

Node version:
v6.10.0
Yarn version:
v0.27.5
windows 10

[crazyabdul]

I had issue with react-native init AwesomeProject that's why I tried yarn in the first place but got this same error. With the react-native command I was prompted to install yarn for a better experience; if not, it will progress without it. Evidently, it did not work.
After seeing the spawn Unknown error with yarn, I decided to try react-native init AwesomeProject again and this time it worked.

Hopefully, some will find this helpful

[BYK]

This is fixed on nightlies, please try them if you need the fix urgently. Otherwise you can wait for the 1.0 release which should happen soon (multiple weeks away).