A problem occurred starting process 'command '..\..\node_modules\hermesvm\win64-bin\hermes''

[valery-lavrik]

React Native version:
System:
OS: Windows 10
CPU: (4) x64 Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz
Memory: 2.00 GB / 7.49 GB
Binaries:
Node: 12.4.0 - C:\Program Files\nodejs\node.EXE
Yarn: 1.7.0 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 6.9.0 - C:\Program Files\nodejs\npm.CMD
IDEs:
Android Studio: Version 3.4.0.0 AI-183.6156.11.34.5692245

Steps To Reproduce

1. cd android
2. ./gradlew clean
3. ./gradlew assembleRelease

**> Configure project :react-native-webview
:react-native-webview:reactNativeAndroidRoot E:\RN\st-react-native\node_modules\reactative\android

Task :app:bundleReleaseJsAndAssets
warn The following packages use deprecated "rnpm" config that will stop working from xt release:

• rn-fetch-blob: https://github.com/joltup/rn-fetch-blob#readme
  Please notify their maintainers about it. You can find more details at https://githubom/react-native-community/cli/blob/master/docs/configuration.md#migration-guide.
  release:
• rn-fetch-blob: https://github.com/joltup/rn-fetch-blob#readme
  Please notify their maintainers about it. You can find more details at https://github.com/react-native-community/cli/blob/master/docs/configuration.md#migration-guide.
  Loading dependency graph, done.
  info Writing bundle output to:, E:\RN\st-react-native\android\app\build\generated\assets\react\release\index.android.bundle
  info Writing sourcemap output to:, E:\RN\st-react-native\android\app\build\intermediates\sourcemaps\react\release\index.android.bundle.packager.map
  info Done writing sourcemap output
  info Done writing bundle output
  info Copying 23 asset files
  info Done copying assets

Task :app:bundleReleaseJsAndAssets FAILED

FAILURE: Build failed with an exception.

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

A problem occurred starting process 'command '....\node_modules\hermesvm\win64-bin\hermes''

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

• Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.4.1/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 2m 14s
65 actionable tasks: 59 executed, 6 up-to-date**

---

this happens with the latest updates:

and enableHermes: true

What should I do?

[radko93]

Not sure if it's related, but React Native does not support React 16.9 yet

[valery-lavrik]

@radko93 It's not related. The problem at the time of the operation of hermes. Therefore, I think the reaction itself is not to blame

[radko93]

This should be set on project.ext.react and mirrored here. If it is not set on project.ext.react, JavaScript will not be compiled to Hermes Bytecode and the benefits of using Hermes will therefore be sharply reduced.

Did enable it as it's described here?

[valery-lavrik]

@radko93 Yes of course

[sasclau]

Same problem on windows 10

[seriiix]

It's fine on mac but i have the same problem on win10

[PrimeObjects]

Got the same issue here

[hemmedo]

Same here...isn't there any temporary workaround?

[gpawlik]

@hemmedo please check where hermesvm has been installed within node_modules directory.

The default location is ../../node_modules/react-native/node_modules/hermesvm/%OS-BIN%/hermes but in my case it has been installed in the root of node_modules so I needed to reflect it in the gradle file like this:

project.ext.react = [
    ...some options...
    enableHermes: true,
    hermesCommand: "../../node_modules/hermesvm/%OS-BIN%/hermes"
]

[hemmedo]

@gpawlik Although you were right about the path, it didn't change anything. Still getting the exact same error. Is this the only thing I have to do to make it work?

[gpawlik]

@hemmedo Can you confirm that you have the same path when implementing hermes later on?

    if (enableHermes) {
        def hermesPath = "../../node_modules/hermesvm/android/";
        debugImplementation files(hermesPath + "hermes-debug.aar")
        releaseImplementation files(hermesPath + "hermes-release.aar")
    } else {
        implementation jscFlavor
    }

[andreasbergqvist]

My fix:
#25599 (comment)

[hemmedo]

@gpawlik Fixed it. Turns out problem was really the execution of Hermes in windows so I just used that modified react.gradle for it.

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as a "Discussion" or add it to the "Backlog" and I will leave it open. Thank you for your contributions.

[stale]

Closing this issue after a prolonged period of inactivity. If this issue is still present in the latest release, please feel free to create a new issue with up-to-date information.