Is there a stack trace in the Graphite Errors or Output pane? If not, what about the Graphite logs available in %LocalAppData%\Telerik\BlackDragon\Logs? Please review them from the datetime that you've received the Unknown error and see if there are any errors logged there that contain more than just "Unknown error" and zip and provide those logs for us to review. We also suggest running FiddlerCap
(with the Decrypt HTTPS Traffic option enabled) before launching Graphite and save the HTTP requests Graphite performs to disk and send those our way as well.
If there isn't anything relevant in the logs, can you share which is the project you get this error on and do we have your consent to take a look at it?
All the best,
the Telerik team
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