Team Foundation Error, Page '3185ed96-1cbd-4381-a439-636973542e50' not found

I'm start using Visual Studio 2015 Enterprise and when I want to manage connections or anything else with Team Foundation Server give this error: Team Foundation Error, Page '3185ed96-1cbd-4381-a439-636973542e50' not found. What should I do?!

One thing more...I saw this but not working for me: Page not found in Visual Studio 2012

How do I find my team foundation server URL?

20.152 then the Server URL will be https://172.17.20.152:8080/tfs/. Enter this TFS Server URL on browser to work on TFS. You can find the ServerURL, Username & Password from the Team Foundation Server Administration Console. You need to run OpKey TFS Utility every time while creating a new Collection or Project in TFS.

Try resetting VS to the default settings with the following commands to see if it helps.

1.devenv.exe /safemode

2.devenv.exe /resetskippkgs

3.devenv.exe /installvstemplates

4.devenv.exe /resetsettings

5.devenv.exe /resetuserdata