gen already exists but is not a source folder. Convert to a source folder or rename it.

异常提示: gen already exists but is not a source folder. Convert to a source folder or rename it. 错误原因: 我在导入以前的项目的时候出现了这个异常,原因是.classpath文件(这个文件在eclipse中是看不到的,必须在文件浏览器中才能看到并编辑)出错,导致eclipse不能识别我的src代码文件夹,需
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