The Web project name in Eclipse has a red fork, but there is no red fork solution for every file underneath it __web

Problem Description: The Web project name in Eclipse has a red fork, but there is no Red Cross for every file underneath.

Reason: There's a lot of reasons, and here I only record the reason for my error: Because I used the server in the eclipse's own basic, and then it went wrong.

WORKAROUND: Re-new Apache (Tomcat) service, successfully resolved.

Operation: Click on the service--> right---> Click new--> click Server--> Choose Apache under your some tomcat (need to download yourself)--> click Finish. Complete

Detailed diagram: