Hi, I have problem with using luabing in different DLLs. In CORE.DLL I define manager_c and in RENDER_MANAGER.DLL I define render_mc like below. The error is: "You cannot derive from an unregistered type" - assert somewhere in CORE.DLL module(_lua) [ class_<manager_c>("manager_c") .def("getName", manager_c::getName) .property("priority", &manager_c::getPriority, &manager_c::setPriority) ]; somewhere in RENDER_MANAGER.DLL module(_lua) [ class_<render_mc, bases<manager_c> >("render_mc") .def("initRenderer", &initRenderer) .def("releaseRenderer", &render_mc::releaseRenderer) ];