错误提示：

	FAILURE: Build failed with an exception.
	
	* Where:
	Initialization script 'C:\Users\j2019.zhu\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 1s

解决办法：

• 项目根目录下找到【.idea】目录下的【gradle.xml】文件
• 找到【delegatedBuild】选项并改为【false】

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

如果没找到，则手动添加这一行