＞ Could not create task ‘:app:MyTest. main()‘. ＞ SourceSet with name ‘main‘ not found. Problem repair

Android studio Unable to execute Java Class main Methods problems and solutions  

FAILURE: Build failed with an exception.

* Where:
Initialization script 'C:\Users\eerdunsang\AppData\Local\Temp\MyTest_main__.gradle' line: 21

* What went wrong:
A problem occurred configuring project ':app'.
> Could not create task ':app:MyTest.main()'.
   > SourceSet with name 'main' not found.

* 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

BUILD FAILED in 9s
9:10:31: Task execution finished 'MyTest.main()'.

resolvent ：
stay .idea Under folder gradle.xml In file <GradleProjectSettings> Add under label <option name="delegatedBuild" value="false" />, Then run it again

<option name="delegatedBuild" value="false" />