only problem in when i build a release app

[wigiart]

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:minifyReleaseWithR8'.

A failure occurred while executing com.android.build.gradle.internal.tasks.R8Task$R8Runnable
Compilation failed to complete, origin: C:\coding\Android Apps\wigiart_app\build\flutter_contacts\intermediates\runtime_library_classes_jar\release\classes.jar:com/wigiart/birthdayapp/BuildConfig.class

• Try:

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BUILD FAILED in 8m 58s
Running Gradle task 'assembleRelease'... 541.6s
Gradle task assembleRelease failed with exit code 1