Ask your DBA is a kind of funny Oracle solution! :-)
ORA-28529: invalid or missing parameter in Net8 service name definition
Cause: There was an invalid or missing Heterogeneous Services parameter in the Net8 service name definition stored in either the TNSNAMES.ORA file or in the Oracle Names Server.
Action: Ask your DBA to make sure the information in the Net8 service definition is correct and complete. The correct information that should be included in the Net8 service definition can be found in the agent's documentation.