I have just recently taken over looking after a database. Upon checking the alert log i found several of these messages:
ORA-0nnnn: Message nnnnn not found; no message file for product=RDBMS, facility=ORA; arguments: 
where nnnn is the ora-error number.
None of these errors seem to be serious but why is the message file not found? Is it because the installation was not done correctly or the ORACLE_HOME paths have been screwed up?
Any advice will be appreciated.