Unfortunately CatLight does not seem to be working.
I seem to be able to successfully authenticate with my domain account and select the Builds, Releases and Workitems, however, I then get a 400 error.
Could you please advise what my issue may be?
Please refer to attached log files and screenshot.
Looks like CatLight gets this error when it tries to execute a work item query. TFS queries can break down when an area or iteration path is deleted.
You can try to identify the problematic query by checking them one by one until the app breaks. Or you can use Fiddler web debugging proxy to intercept communication between CatLight and TFS and see what specific request ends in 400 error. There also might be additional information about the problem in TFS response.
