The project was not built due to "Could not delete '/XXX/WebRoot/WEB-INF/classes/library'.". Fix the

在构建插件时提示以下错误：

Description Resource Path Location Type The project was not built due to "Could not delete '

在网上查找时发现，最简单的解决方法是：project-->clean，选择出错的工程，点击肯定错误便可消除。