GtkButton GtkHScale

[Johannes Postma <jhnns hccnet nl>]

Hello,

I have an application with a GtkButton and a GtkHScale.The button is
used to set the value of the GtkHScale. Unfortunately my code doesn't
work. I get the next error:

Gtk-CRITICAL **: file gtkrange.c: line 669 (gtk_range_set_value):
assertion `GTK_IS_RANGE (range)' failed

My code is:

void on_BUTTON_clicked (GtkButton *button, gpointer user_data)
{
        GtkHScale *scale = (GtkHScale *)g_object_get_data(G_OBJECT(button),
"hscale1");
        gtk_range_set_value(GTK_HSCALE(scale), 0);  
}

Can someone help me?

Johannes