If anyone is still having this issue with Indigo (3.7.2), try deleting your .metadata folder in your workspace, it may be corrupted. See this StackoverFlow Q/A http://stackoverflow.com/a/11153397/1020470. It worked for me.
If anyone is still having this issue with Indigo (3.7.2), try deleting your .metadata folder in your workspace, it may be corrupted. See this StackoverFlow Q/A http:// stackoverflow. com/a/11153397/ 1020470. It worked for me.