(monouml0.2a:20994): Gtk-CRITICAL **: gtk_file_system_path_is_local: assertion `path != NULL' failed
saving as /home/mario/Documents/aja.xmi
SerializationDriver.Serialize> replacing uri  by /home/mario/Documents/aja.xmi

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
in <0x00368> ExpertCoder.Xmi2.SerializationDriver:Serialize (IEnumerable objectList)
in <0x000b3> ExpertCoder.Xmi2.SerializationDriver:Serialize (IEnumerable objectList, System.IO.Stream stream, System.String uri, Boolean mustCloseStream)
in <0x00042> ExpertCoder.Xmi2.SerializationDriver:Serialize (IEnumerable objectList, System.String filename)
in <0x0023e> MonoUML.Widgets.Hub:SaveAs ()
in <0x00030> MonoUML.Widgets.Hub:Save ()
in <0x00010> MonoUML.GUI.MonoUML:OnSaveProject (System.Object o, System.EventArgs args)
in (wrapper delegate-invoke) System.MulticastDelegate:invoke_void_object_EventArgs (object,System.EventArgs)
in <0x00093> GLib.Signal:voidObjectCallback (IntPtr handle, IntPtr gch)
in (wrapper native-to-managed) GLib.Signal:voidObjectCallback (intptr,intptr)
in <0x00000> <unknown method>
in (wrapper managed-to-native) Gtk.Application:gtk_main ()
in <0x00007> Gtk.Application:Run ()
in <0x003da> MonoUML.GUI.MonoUML:.ctor (System.String[] args)
in <0x00019> MainWindow:Main (System.String[] args)
make: *** [run] Error 1