We just upgraded TFS and I am getting the following error:
"Error calling VSTS/TFS API. Provided application token signature is not present or in invalid."
What do I do now?
This error message means that for some reason, the application token became invalid (probably because of the TFS update).
To fix it, you need to recreate the extension in TFS.
The easiest way to do this is to open the Timetracker Configuration Tool -> Then select any sub-menu -> Click apply (it will reapply the current settings and recreate the extension).
If this doesn't work, try reinstalling Timetracker.