I have multiple projects in our solution that is in our TFS 2010 repository. I\'ve added about 5 new projects to this solution in recent days.
I have found that for one
I was faced with the same issue but the solution is slightly different than those mentioned so far. My project's contents were checked in but the project itself was not. The project's bindings were valid.
In the Team explorer's Source Code Explorer, the project files were greyed out. After a get-latest, TFS opened the Merge Conflicts screen where I could choose to keep the local copy.
After this, the project was part of TFS.
Your project doesn't have appropriate Source Control Bindings! With the solution open, you'll need to go to File -> Source Control -> Change Source Control
to view the bindings for your projects. The failing one probably will show an "Unknown" or not binded status. You can then use that dialog to correct the binding and check in the project file.
Appended Alternate Solution -
Navigate to the Team Explorer -> Source Control
and manually add the files using the "Add Items to Folder" menu item.
You can try following steps
1 Unbind the project in "Change Source Control" dialog
2 Refresh project to update source control status
3 Right click the project and click Add the Project to source Control in solution explorer