Cannot lock Build Output Cleanup Cache

Question

I am having issues with my flutter project. Whenever I run the flutter build apk command. I get the following error message. I tried flutter clean but it does not solve the problem. Here is my error message.

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'android'.
> Could not determine the dependencies of null.
   > Could not resolve all dependencies for configuration ':classpath'.
      > Could not create service of type OutputFilesRepository using ExecutionGradleServices.createOutputFilesRepository().
         > Cannot lock Build Output Cleanup Cache (C:\Users\JUSTINE NALWOGA\Desktop\EDUSELF FINAL\eduself\android\.gradle\buildOutputCleanup) as it has already been locked by this process.

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

BUILD FAILED in 5m 22s
Running Gradle task 'assembleRelease'...                          337.9s
Gradle task assembleRelease failed with exit code 1

Answer 1

Try running this command in a terminal,

find ~/.gradle -type f -name "*.lock" -delete

or

Go to /.gradle folder and manually delete all files ending with .lock.

Then run flutter clean,

flutter pub get and finally run

flutter build apk.