fork problem

[Chan Wai <h0023427 eee hku hk>]

Dear all,

I have tried to write a program, which also act as a server when I run it.
I use gtk/gnome to build an interface for it. However, when I run it, there is 
error on the child programme:

Gdk-ERROR **: BadIDChoice (invalid resource ID chosen for this connecion)
  serial 30742 error_code 14 request_code 1 minor_code 0

my program can be simplified as follow

int main(int argc, char *argv[])
{
  /* some gnome setting */
  if ( fork() ) {
    /* server programme */
  else
    gtk_main();
  return 0;
}

when I run the server programme in the child and run the gtk_main() in the 
parent, the same problem comes out and the server programme can't work at
this time.

Could you plz help me on the above issue?? Thank you very much.

Best wishes,
Wai