mangosd error LNK2019: unresolved external symbol "protected: void __thiscall WorldSession::HandleSetLfgOpcode(class WorldPacket &)" (?HandleSetLfgOpcode@WorldSession@@IAEXAAVWorldPacket@@@Z) referenced in function "protected: struct OpcodeHandler * __thiscall WorldSession::_GetOpcodeHandlerTable(void)const " (?_GetOpcodeHandlerTable@WorldSession@@IBEPAUOpcodeHandler@@XZ)