springboot can not load the main class of problems

1, start the reported error: Can not find or load the main class org.spring.springboot.Application

The reason: There may be multiple module in the project below, and then inside the module configuration file iml more than one
solution: Remove the extra iml file, only to remaining a

2、报错：cannot access org.springframework.context.ConfigurableApplicationContext

This is also the reason above, remove the extra iml file