Message file not found
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.
Any of these two:
"because the installation was not done correctly or the ORACLE_HOME paths have been screwed up"
How do fix it if it is a corrupt installation? At the mo i cant see any hinderance to the database. The only problem seems to be the Oracle alert log messages are not translated ?
First check that the ORA_NLS33 environment parameter is set correctly. ;)
HINT: Default location is: $ORACLE_HOME/ocommon/nls/admin/data :D
ORA_NLS33 does not exist in 10g; it's ORA_NLS10. Also, take a look at Metalink note 372824.1. Some of the more recent critical patch updates can cause this and you need to build oraus.msb from oraus.msg to fix it.