** could not be redeployed because it could not be completely removed in the undeployment phase

今天从git拉取项目之后，重新发布的时候MyEclipse弹出一个错误： 

    ** could not be redeployed because it could not be completely removed in the undeployment phase. the most common cuase of this problem is attempting to redeploy while the server is running,which has locked one or more files. ............

原因：以前的jar文件不存在了，但是项目的.classpath文件中还有不存在的jar文件引用。 

解决办法：右键点项目名称，选择Properties,选择Java Build Path,选择Libraries,把Web App Libraries Remove即可，如图。



然后再点"Add  library"，选择Web App Libraries 。



之后选择你的项目就可以了。



然后再次发布。