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

December 18, 2012

操作系统与开发环境

最近android项目老是弹出这个错误,很烦人。有时候把gen目录删除了,让eclipse重新生成一个就好了。不过有时候好好的,这个目录突然不出现在配置的源目录里了,很郁闷,不知道是什么原因造成的。

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

This is a common error and you can solve it following these steps:

  • Right click on the project and go to “Properties”
  • Select “Java Build Path” on the left
  • Open “Source” tab
  • Click “Add Folder…”
  • Check “gen” folder and click Ok and Ok again
  • Again right click on the project and in the “Andriod Tools” click on “Fix Project Properties”

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