Our application can only connect to AccountRight if the “MYOB Add-On Connector” is running on your computer. For AccountRight versions 2016.2 and earlier, make sure the MYOB Add-On Connector is correctly installed and running. 


In the MYOB program group, you should have this “MYOB Add-On Connector”.


Open it and it will run the service which you can see running in the Notification Area/System Tray. You can open it to see it running or stop it. You can also test the URL (http://localhost:8080/AccountRight) to verify the service is working.


Reference:

http://help.myob.com/wiki/display/ar/Add-ons#expand-HowdoIresolveanerrorstatuswiththeMYOBAddOnConnector