Server error [A6]: Unable to set Github listener

When I try to deploy my Github app, I get this error message: “Server error [A6]: Unable to set Github listener”. I tried doing it with the Github URL as well, but no luck. The link to the file is: cwarp-tool/cwarp_app.py at master · Atticus-Capital/cwarp-tool · GitHub.

Let me know how I can troubleshoot this, thanks!
Trent