This error occurs when attempting to connect the MYOB desktop connector to a version of MYOB which is not compatible with the connector.
To resolve this issue, upgrade your version of MYOB to one of the below versions:
MYOB AccountRight version 17
MYOB AccountRight version 18
MYOB AccountRight version 19
MYOB AccountRight version 19.13
MYOB AccountRight version 2014
MYOB AccountRight version 2015
MYOB AccountRight version 2016 or 2016.3