myeclipse reported red cross problem

1. The introduction of js into myeclipse reports the red cross problem

Import a js file, report a red cross, change a new one and still report a red cross, and finally see the solution in a forum

Because myeclipse has not been told to verify it. The solution, select the js file, right-click Myeclipse--ManaValidation--ExcludeResource-- (select all or that js)--OK

2. There are no errors in the project but the project name has a red cross

The jdk versions in the three locations below the figure should be the same.