There is no stacktrace , however the only popup message displays this message
'Make sure your application is running locally with the latest External Database Connector module included to test connection and run queries.
FYI-
1.MySQL is running locally on my laptop at 3306 port
2. I have downloaded the ExternalDatabaseConnector from Markeplace in MQ Studio pro 10.20
My app was not running locally . I ran the application and was able to connect to DB successfully. Thanks for your help !!.