TNS message not found

Has anyone come accross this error message before

I am running 10.2.0.3 oracle database

**********************
tnsping IBI

TNS Ping Utility for HPUX: Version 10.2.0.2.0 - Production on 10-OCT-2006 17:05:27

Copyright (c) 1997, 2005, Oracle. All rights reserved.

Message 3511 not found; No message file for product=network, facility=TNSMessage 3512 not found; No message file for product=network
, facility=TNSAttempting to contact (DESCRIPTION = (SDU = 32768) (TDU = 32768) (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = i
eux1) (PORT = 1527))) (CONNECT_DATA = (SID = IBI) (GLOBAL_DATA = IBI)))
Message 3509 not found; No message file for product=network, facility=TNS

Do you have your ORACLE_HOME set correctly ?

yes - have set it and checked with another system whcih is up and running on same server. checked tnsnames.ora as well as listener.ora files for both systems

echo $ORACLE_HOME
echo $PATH

what do they return