Getting an "There has been an error while processing the form." error while submitting a browser based InfoPath form :

While working on a Browser based InfoPath error was struck by an error message while submitting the form.


The intresting part was that the form was working perfectly when run from InfoPath client.


Something in the form was preventing it from getting submitted.Could not locate the culprit even after thorough recheck of logic.


Thanks to this thread for helping me to find that the cause was a Secondary data connection
that was not getting used anywhere in the main datasource.