GtkTextBuffer, insert_text

[Mohammed Sameer <uniball gmx net>]

Hi all
i have a small problem

i have a textbuffer

  contents = gtk_text_view_new ();
  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (contents));
        /* Implementing undo/redo... */
insert = g_signal_connect (GTK_OBJECT (buffer), "insert_text",
                        GTK_SIGNAL_FUNC (text_insert_cb), NULL);

and the callback
void text_insert_cb(GtkTextBuffer *buffer,
                                            GtkTextIter pos,
                                            const gchar *text,
                                            gint length,
                                            gpointer user_data)
{
 fprintf(stderr,"%s", text);
}

but it prints some garbage 
and when i run the program i get:
GLib-GObject-WARNING **: invalid cast from `GtkTextBuffer' to `GtkObject'

what's the problem here ?
can anyone point me ??

Thanks a million

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