Hi,

This error usually means that the charachter set you are refereing to does not exist on the system.

what was the charachter set before you tried to change it ? and waht did you want to change it to ?

I f you are using a charachter set other than the default US7ASCII, you have to set the following partamters depending on your operatins sytem and database version:

RDBMS 7.2.x -> ORA_NLS
RDBMS 7.3.x -> ORA_NLS32
RDBMS 8.0.x -> ORA_NLS33
RDBMS 8.1.x -> ORA_NLS33

This parameter should
point to your $ORACLE_HOME/ocommon/nls/admin/data directory.