Article From:https://www.cnblogs.com/Jomini/p/9967882.html

Turn off eclipse and delete the. metadata file under the workspace working directory. If you can’t see the. metadata file, you can see “ctril + H”. Then reopen eclipse and import the project

 

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Reference resources:

https://blog.csdn.net/lgh1117/article/details/7639615

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