Can’t Connect to CDS

I have configured everything appropriately and when I enter in the connection information the connection is successful and I see:

Connection to CDS has been tested successfully. Click Save settings to connect to CDS.

I save the settings but when I go to the status it sill says “Not Connected” When I look at the connection details this is the error that is being shown:

JSON.parse: unexpected character at line 1 column 1 of the JSON data

I have tried re-installing the app and clearing cache but I get the same error.

Thanks.