#0  0x00007fb97c7754a5 in g_type_check_instance_is_fundamentally_a (type_instance=type_instance@entry=0x8884831c, fundamental_type=fundamental_type@entry=80) at /build/buildd/glib2.0-2.41.4/./gobject/gtype.c:3979
  [Error: /build/buildd/glib2.0-2.41.4/./gobject/gtype.c was not found in source tree]
#1  0x00007fb97c7570c7 in g_object_unref (_object=0x8884831c) at /build/buildd/glib2.0-2.41.4/./gobject/gobject.c:3067
  [Error: /build/buildd/glib2.0-2.41.4/./gobject/gobject.c was not found in source tree]
#2  0x0000000000468855 in container_child_background_set (source_object=<optimized out>, res=0x2910250, user_data=<optimized out>) at mate-panel-applet-frame-dbus.c:240
  235: 	MatePanelAppletFrameDBus *frame = MATE_PANEL_APPLET_FRAME_DBUS (user_data);
  236: 
  237: 	mate_panel_applet_container_child_set_finish (container, res, NULL);
  238: 
  239: 	if (frame->priv->bg_cancellable)
  240: 		g_object_unref (frame->priv->bg_cancellable);
  241: 	frame->priv->bg_cancellable = NULL;
  242: }
  243: 
  244: static void
  245: mate_panel_applet_frame_dbus_change_background (MatePanelAppletFrame    *frame,
#3  0x00007fb97ca06877 in g_simple_async_result_complete (simple=0x2910250) at /build/buildd/glib2.0-2.41.4/./gio/gsimpleasyncresult.c:763
  [Error: /build/buildd/glib2.0-2.41.4/./gio/gsimpleasyncresult.c was not found in source tree]
#4  0x0000000000469a33 in set_applet_property_cb (source_object=<optimized out>, res=0x29102c0, user_data=<optimized out>) at mate-panel-applet-container.c:560
  555: 		g_variant_unref (retvals);
  556: 	}
  557: 
  558: 	container = MATE_PANEL_APPLET_CONTAINER (g_async_result_get_source_object (G_ASYNC_RESULT (result)));
  559: 	g_hash_table_remove (container->priv->pending_ops, result);
  560: 	g_simple_async_result_complete (result);
  561: 	g_object_unref (result);
  562: 
  563: 	/* g_async_result_get_source_object returns new ref */
  564: 	g_object_unref (container);
  565: }
#5  0x00007fb97ca06877 in g_simple_async_result_complete (simple=0x29102c0) at /build/buildd/glib2.0-2.41.4/./gio/gsimpleasyncresult.c:763
  [Error: /build/buildd/glib2.0-2.41.4/./gio/gsimpleasyncresult.c was not found in source tree]
#6  0x00007fb97ca6115c in g_dbus_connection_call_done (source=<optimized out>, result=<optimized out>, user_data=0x21e5d30) at /build/buildd/glib2.0-2.41.4/./gio/gdbusconnection.c:5502
  [Error: /build/buildd/glib2.0-2.41.4/./gio/gdbusconnection.c was not found in source tree]
#7  0x00007fb97ca06877 in g_simple_async_result_complete (simple=0x2910330) at /build/buildd/glib2.0-2.41.4/./gio/gsimpleasyncresult.c:763
  [Error: /build/buildd/glib2.0-2.41.4/./gio/gsimpleasyncresult.c was not found in source tree]
#8  0x00007fb97ca068d9 in complete_in_idle_cb (data=<optimized out>) at /build/buildd/glib2.0-2.41.4/./gio/gsimpleasyncresult.c:775
  [Error: /build/buildd/glib2.0-2.41.4/./gio/gsimpleasyncresult.c was not found in source tree]
#9  0x00007fb97c47cb2d in g_main_dispatch (context=0x21cfbf0) at /build/buildd/glib2.0-2.41.4/./glib/gmain.c:3064
  [Error: /build/buildd/glib2.0-2.41.4/./glib/gmain.c was not found in source tree]
#10 g_main_context_dispatch (context=context@entry=0x21cfbf0) at /build/buildd/glib2.0-2.41.4/./glib/gmain.c:3663
  [Error: /build/buildd/glib2.0-2.41.4/./glib/gmain.c was not found in source tree]
#11 0x00007fb97c47cf08 in g_main_context_iterate (context=0x21cfbf0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.41.4/./glib/gmain.c:3734
  [Error: /build/buildd/glib2.0-2.41.4/./glib/gmain.c was not found in source tree]
#12 0x00007fb97c47d232 in g_main_loop_run (loop=0x2549810) at /build/buildd/glib2.0-2.41.4/./glib/gmain.c:3928
  [Error: /build/buildd/glib2.0-2.41.4/./glib/gmain.c was not found in source tree]
#13 0x00007fb97debd457 in IA__gtk_main () at /build/buildd/gtk+2.0-2.24.24/gtk/gtkmain.c:1271
  [Error: /build/buildd/gtk+2.0-2.24.24/gtk/gtkmain.c was not found in source tree]
#14 0x0000000000422655 in main (argc=1, argv=0x7fff9529b338) at main.c:172
  167: 
  168: static void on_applet_realized(GtkWidget* widget, gpointer user_data)
  169: {
  170: 	MatePanelApplet* applet;
  171: 	AppletData* data;
  172: 	NaTray* tray;
  173: 	GtkActionGroup* action_group;
  174: 	gchar* ui_path;
  175: 
  176: 	applet = MATE_PANEL_APPLET(widget);
  177: 	data = g_object_get_data(G_OBJECT(widget), "system-tray-data");