New Set up: Error Trying to connect to SABnzbd

I’m trying to set up Sonarr to connect to SABnzbd and I’m getting the following error:

Test was aborted due to an error: Unexpected character encountered while parsing value: <. Path ‘’, line 2, position 1.

Any help would be appreciated.

thanks

mal

SAB returned something invalid by the sound of it, check trace logs to see what SAB returned.