Cannot Checkin in TFS 2013 - Value cannot be null Parameter name: format
tfs
Solution
Do you have the applicable updates for VS2012 to connect to VS2013?
According to Compatibility between Team Foundation clients and Team Foundation Server, under TFS 2013 client support for VS2012:
Requires latest Visual Studio 2012 update. Supports Git with Visual Studio Tools for Git extension.
The latest VS2012 update is Update 4.
Problem
It has been a week since this has started happening. Whenever I try to check in my code in Visual Studio 2012 I get the following from TFS 2013. I've not made any changes to my Visual Studio, and no one else on the team is getting this error. I'm confused as to the cause of the issue, what can I do to diagnose why this is happening?