system-config-network does not launch
 

When i am trying to open system-config-netwrok , the following error comes

rror in sys.excepthook:
Traceback (most recent call last):
File "/usr/sbin/system-config-network-gui", line 67, in <lambda>
PROGNAME, PRG_VERSION)
File "/usr/lib/python2.3/site-packages/rhpl/exception.py", line 281, in handleException
rc = exceptionWindow (_("Exception Occurred"), text, progname)
File "/usr/lib/python2.3/site-packages/rhpl/exception.py", line 166, in exceptionWindow
win = ExceptionWindow (text, name)
File "/usr/lib/python2.3/site-packages/rhpl/exception.py", line 35, in __init__
win = gtk.Dialog(_("Exception Occurred"), None, gtk.DIALOG_MODAL)
AttributeError: 'module' object has no attribute 'Dialog'

Original exception was:
Traceback (most recent call last):
File "/usr/sbin/system-config-network-gui", line 70, in ?
import gtk
File "/usr/lib/python2.3/site-packages/gtk-2.0/gtk/__init__.py", line 43, in ?
from _gtk import *
ImportError: /usr/lib/python2.3/site-packages/gtk-2.0/gtk/_gtk.so: undefined symbol: PyUnicodeUCS2_FromUnicode


Why is this so?