Using the dbus mono bindings, when trying to reference a dbus object in the same
assembly as it was exported:

MyObj obj = new MyObj();
dbus_service.RegisterObject(obj, "/org/adam/Mess/obj");
...

MyObj same_obj = service.GetObject(typeof(MyObj), "/org/adam/Mess/obj") as MyObj;

i get the exception:

Unhandled Exception: System.ArgumentException: Duplicate file name
'org.adam.Mess.proxy.dll'
in <0x0040a> System.Reflection.Emit.AssemblyBuilder:check_name_and_filename
(string,string,bool)
in <0x0002b> System.Reflection.Emit.AssemblyBuilder:DefineDynamicModule
(string,string,bool,bool)
in <0x0001f> System.Reflection.Emit.AssemblyBuilder:DefineDynamicModule
(string,string,bool)
in <0x0008c> DBus.Service:get_Module ()
in <0x000b4> DBus.ProxyBuilder:GetProxy ()
in <0x0004b> DBus.Service:GetObject (System.Type,string)
in <0x00053> Mess.Gui.UnknownMonitor:.ctor ()
in <0x00071> Mess.Gui.Mess:.ctor ()
in <0x00020> Mess.Gui.Mess:Main (string[])