Using qListView to fetch data from parent list and a related child list, a filter has been applied on the ID which is taken up from URL of the page as “TESTID”. As soon as you pass "TESTID" to the page it is throwing an error: 

“Unexpected error has occurred.”

If we remove the child list, it works fine. Earlier with QuickApps 6.2 this worked fine but with version 6.3 it is throwing this error.