[sword-devel] I cannot set icon in GTK

[sword-devel@crosswire.org]

     mainwin = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     gtk_window_set_title(GTK_WINDOW(mainwin), prog_name);
     gtk_window_set_default_size(GTK_WINDOW(mainwin), 600, 400);
     GdkPixbuf *icon16 = gdk_pixbuf_new_from_file("ld16.png", &error);
     gtk_window_set_icon(GTK_WINDOW(mainwin), icon16);

It gives the error message:

(ldedit:2166): Gtk-CRITICAL **: file gtkwindow.c: line 2086 
(gtk_window_realize_icon): assertion `info->icon_pixmap == NULL' failed

What is wrong? (I use GTK 2.)
-- 
Victor Porton (porton@ex-code.com)