jar cannot be read or is not a valid ZIP file

Archive for required library: '**.jar' in project 'ProjectName' cannot be read or is not a valid ZIP file
在外国找到以下回答,按照一下方法重启Eclipse 即可解决
It can be Eclipse bug. I have faced the similar problem several times. closing and reopening the project works sometime. if it doesn't work try restarting Eclipse.

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