**** Update on February, 9, 2013 *****
Sometimes there are errors like “Cannot find team project” or you can’t create a project because duplicate name despite of you don’t have one or you are not connected to that one that have this project, so all you have to do just clear the cache example of the error that could occur the following error
For example I clear my cache from the following path
C:\Users\MRadwan\Local Settings\Application Data\Microsoft\Team Foundation\3.0\Cache
This will cause your client Tool to download a fresh copy of the cache the next time it deals with the server.
And everything will going well.
**** Begin of update ****
When we need to delete the server cache, we will navigate to “C:\ProgramData\Microsoft\Team Foundation\Web Access\….“
delete the cache files and reset the IIS.
**** End of update ****

You saved my afternoon! And this is no spam post, haha. I tried to delete all the TFS bindings manually, but no success. This helped!
Only if I could find this before wasting my week. Thank you.
thank you! saved my day
This worked for me too.. Ty for the post
thnx !! I could’nt recreate a TFS project after deleting it (we created it first with the wrong process template) but now it works !
Thankyou!
Been trying to figure out why I can’t add a project to Team Foundation Server for hours. This did the trick!