yahoo chat client err

[harsha <harshu@hd2.vsnl.net.in>]

hi,
   When I try to launch ymessenger it gives this error message. 

Gdk-CRITICAL **: file gdkfont.c: line 220 (gdk_font_ref): assertion `font != NULL' failed.
Segmentation fault

  I think I am missing a required package but I don't know which. I
would really appreciate if somebody tell me this.

regards
harsha