myeclipse部署tomcat问题

MyEclipse部署tomcat时出现：

Deployment is out of date due to changes in the underlying project contents. You'll need to manually 'Redeploy' the project to update the deployed archive.

本来好的部署项目，过了几天再部署时就出现上面错误。

解决办法：

删除项目再import一次项目。不用重新新建项目。