Ombi Can't Connect To CounchPotato

I have both Ombi and CounchPotato installed. I entered a username/password for CouchPotato with the default port 5050. When I enter this information in and try to “Request API Key” it fails with “Something went wrong!”. If I manually provide the API key and test the connection I get “Could not connect to CouchPotato, please check your settings. Exception Message: Object reference not set to an instance of an object”. Am I missing something, am I using the wrong port, is there a certain IP I should use (I tried localhost/ IP).