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

在構建插件時提示以下錯誤：

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

在網上查找時發現，最簡單的解決方法是：project-->clean，選擇出錯的工程，點擊肯定錯誤便可消除。