Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
at Hipo.TracksView.StoreSortFunc (Gtk.TreeModel,Gtk.TreeIter,Gtk.TreeIter) <0x000a8>
at (wrapper delegate-invoke) System.MulticastDelegate.invoke_int_TreeModel_TreeIter_TreeIter (Gtk.TreeModel,Gtk.TreeIter,Gtk.TreeIter) <0x000be>
at GtkSharp.TreeIterCompareFuncWrapper.NativeCallback (intptr,Gtk.TreeIter&,Gtk.TreeIter&,intptr) <0x0011b>
at (wrapper native-to-managed) GtkSharp.TreeIterCompareFuncWrapper.NativeCallback (intptr,Gtk.TreeIter&,Gtk.TreeIter&,intptr) <0x00042>
in (unmanaged) 0xb672cfc7
at (wrapper managed-to-native) Gtk.ListStore.gtk_list_store_set_value (intptr,Gtk.TreeIter&,int,GLib.Value&) <0x00004>
at Gtk.ListStore.SetValue (Gtk.TreeIter,int,GLib.Value) <0x00025>
at Gtk.ListStore.AppendValues (System.Array) <0x000d4>
at Gtk.ListStore.AppendValues (object[]) <0x00014>
at <>AnonHelp<4>.<#AnonymousMethod>5 (object,System.EventArgs) <0x00116>
at (wrapper delegate-invoke) System.MulticastDelegate.invoke_void_object_EventArgs (object,System.EventArgs) <0x00041>
at InvokeCB.Invoke () <0x0001a>
at (wrapper delegate-invoke) System.MulticastDelegate.invoke_bool () <0x00037>
at TimeoutProxy.Handler () <0x0002a>
at (wrapper native-to-managed) TimeoutProxy.Handler () <0x00036>
in (unmanaged) 0xb7e7cdd5
at (wrapper managed-to-native) Gtk.Application.gtk_main () <0x00004>
at Gtk.Application.Run () <0x00007>
at Gnome.Program.Run () <0x00007>
at Hipo.HipoMainWindow.CreateWindow (string[]) <0x012b9>
at Hipo.HipoMain.Main (string[]) <0x00041>