Couldn't load a xcode project because it is already opened from another project or workspace
I had the exact same problem. Quitting the xcode completely and opening it up again worked.
Quitting Xcode alone didn't work for me. What I did was:
- File->Close Workspace/Project on every open workspace.
- Xcode->Quit
- Open Xcode again and open troublesome workspace
I have close the Xcode completely but IT didn't work. I have killed the procces and It did finally!!! :-)