gen already exists but is not a source folder. Convert to a source folder or rename it.
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文章来源：http://blog.csdn.net/zhufuing/article/details/21086893
在编译开源中国app时，http://git.oschina.net/oschina/android-app/tree/v2.2.1/
PhotoView-library工程会出现异常提示:
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，需要通过设置来指明源码所在的文件夹。
解决办法:
右键项目，选择Properties——Java Build Path——Source——Add Folder...
然后在弹出框中选中项目的src和gen目录，OK即可。如下图所示:
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