我必须删除所有android studio文件(不仅是卸载项目，而且还包括项目).我没有尝试过Raynold的解决方案，因此，如果您有任何问题，可以先尝试一下，然后再删除所有文件.

I had to delete all android studio files (not just uninstall and except your projects). I didn't try Raynold's solution, so if you have any problem you can try it before deleting all the files.