eclipse导入Maven项目报错Unsupported IClasspathEntry kind=4

eclipse导入Maven项目报错： 
An internal error occurred during: "Importing Maven projects". Unsupported IClasspathEntry kind=4 


   1. Right-click on your project, select Maven -> Remove Maven Nature. 
   2.Open you terminal, go to your project folder and do “mvn eclipse:clean” 
   3.Right click on your Project and select “Configure -> Convert into Maven Project” 

或

delete project from eclipse. and run: 
mvn eclipse:clean 
then import project again.