ORA-00042: Unknown Service name string
What triggered the Error:
An attempt was made to use an invalid application service.What should we do to fix it:
Use a valid service name from SERVICE$ or add a new service using the DBMS_SERVICE package.
If this was not sufficient go over to:
Oracle Official Support Knowledge Center
Or maybe those geeks at: StackOverflow Board
Or maybe those geeks at: StackOverflow Board