GTK error in Xterminal

[bluesky]

I kept getting this error message when I used linuxconf in xterminal( either in gnome or kde ):

Error message from remdmin:/dev/dsp:No such device
Error message from remadmin:
Error message from remadmin: GTK_CRITICAL **: file gtk.widget.c:line 1584( gtk_widget_map):assertion 'GTK_WIDGET_VISIBLE(widget)==true' failed.

..........

Is it a linuxconf bug?
I am running redhat v6.1