Problems encountered while deleting resources. Could not delete 'D:\workspace\jiekou\jiekou\WebRoo

报错背景：

lib下面有一个jar包不用的，我想把它删除，

我关闭了tomcat，但是还是删除不掉

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Problems encountered while deleting resources.
  Could not delete 'D:\workspace\jiekou\jiekou\WebRoot\WEB-INF\lib\commons-lang-2.3.jar'.

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怎么删除这个lib包呢？

关闭myelipse 到workspace里把这个项目下面的lib里面对应的jar包删除