Contents tagged with An item with the same key has already been added - Team Foundation (TFS) Error
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"An item with the same key has already been added" - Team Foundation (TFS) Error
Today Morning I was uploading My project to TFS, When I clicked on "add solution to source control" I started getting the error " Server was unable to process request. An item with the same key has already been added "
The error "An item with the same key has already been added" normally occurs if your TFS client cache is corrupted.
To resolve this issue you may install team Foundation Server 2010 Service Pack 1.
Not only this, Service pack 1 resolves many issues which you may face.
Refer Microsoft KB article for more details: KB2182621