AFter Upgrade TFS it’s better to check the SharePoint settings as the following image:
If the folder doesn’t exist TFS will create it and then I can add new SharePoint sites for new project or old projects as well
Here Martin explain how to do that :
http://nakedalm.com/integrate-sharepoint-2013-with-team-foundation-server-2013/
Mohamed Radwan is a Visual Studio ALM MVP, Senior ALM Consultant @ Marvel ALM focus on C#, MVC, JQuery, BDD, TDD, TFS and Practical Agile Implementation. He is the founder of TFSEG User Group, Co-founder of MEAALM Community , the author of DevMagicFake Mocking Framework and a frequent speaker in different Microsoft events. M.Radwan is M.Sc. of computer sciences and information technology in Agile methodology M.Radwan holds number of Microsoft certifications including MCT, MCPD, MCITP in EPM, MCTS (7), MCSD, MCAD and CIW
TFSFAQ 
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