Error code: 501

Sonarr version (exact version): 3.0.0.348/3.0.0.418
Mono version (if Sonarr is not running on Windows): 5.18.0.240
OS: Qnap QTS 4.3.5
Debug logs:
Description of issue: Sonarr was working great for at least a year. I’m not sure what happened, but now I get an error displaying in browser (what is displayed in browser):

Error response
Error code: 501

Message: Unsupported method ('GET').

Error code explanation: HTTPStatus.NOT_IMPLEMENTED - Server does not support this operation.

19-4-5 09:42:46.3|Fatal|ConsoleApp|Address already in use. This can happen if another instance of Sonarr is already running another application is using the same port (default: 8989) or the user has insufficient permissions

I tried to upgrade to the newest, via a qpkg, but to no avail. HELP

changed port numbers. all is well.

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