Hi everyone, I tried to startup my oracle database via sqlplus and got this error:

SQL*Plus: Release 10.1.0.4.0 - Production on Thu Apr 19 17:31:07 2007

Copyright (c) 1982, 2005, Oracle. All rights reserved.

SQL> connect / as sysdba
ERROR:
ORA-12705: invalid or unknown NLS parameter value specified


SQL> exit
$ env |grep NLS_LANG
NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1

I checked my NLS_LANG and it's okay. I tried to search for this error on the web but couldn't find any good answer. Can you please help me?

Thanks