错误： Some projects cannot be imported because they already exist in the workspace
网上很多人说把工程改个名就行了，这还特么还用你说？
如果是一个公司工程，你能随便改名？都没有找到根本原因就敢说，简直误人子弟！
解决方法：
1. 真有工程名存在，原工程未删除。你改个名就可以了
2. 并没有这个工程存在，你已经删除，但是依然报这个错， 找到下面路径：
\workspace-work\.metadata\.plugins\org.eclipse.core.resources\.safetable\org.eclipse.core.resources
在里面搜索你冲突的工程名，肯定能搜索到。删除工程名的整行。后面一般有tree = 1 大概这个字样。
再导入，OK。
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