Oracle XML Developers Kit 10.2.0.2.0 - Production

XML-25007: Cannot acquire a database connection to process page.
Listener refused the connection with the following error:
ORA-12514, TNS:listener does not currently know of service requested in connect descriptor
The Connection descriptor used by the client was:
//ohk003.im.jku.at/kimdb002.ohk003.im.jku.at