Execution failed for task ':examplecases:packageRelease'.
> A failure occurred while executing com.android.build.gradle.tasks.PackageAndroidArtifact$IncrementalSplitterRunnable
   > com.android.ide.common.signing.KeytoolException: Failed to read key aaa from store "C:\Users\a\Desktop\NewProject\aaa.jks": Invalid keystore format

* 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.

Solution:

Open file -> settings.

Set the JDK version to 11, repack and solve the problem.