LANG setting under RedHat

If encounter the following Message udner Redhat or Fedora Core

tuxwsvr and wlinstn logs :
165622.linuxcts!wlisten.1380.1024.-2: 09-11-2002: Tuxedo Version 8.0

165622.linuxcts!wlisten.1380.1024.-2: WEBGUI_CAT:3102: INFO: wlisten starting

165622.linuxcts!wlisten.1380.1024.-2: NLS:4: Cannot open message catalog WEBGUI_CAT, set 1, num 3108; check TUXDIR=/usr/bea/tuxedo8.0, LANG=en_US

Then
LANG=C; export LANG