[Boost-users] [Serialization] assert fail and unregistered class

Hi I get assert fail and "unregistered class - derived class not registered or exported" when serializing. I have many classes being saved already in the code but i ran to a problem saving certain std::list with derived classes. (I also have similar classes and list being serialized before) i think its the same issue as in here: http://boost.2283326.n4.nabble.com/serialization-polymorphic-archives-runtim... i have boost version 1.46.1 and visual studio express 2010 heres the call stack:       msvcr100d.dll!_wassert(const wchar_t * expr, const wchar_t * filename, unsigned int lineno)  Line 325   C        gamevc10dbg.exe!boost::archive::detail::basic_serializer_map::find(const boost::serialization::extended_type_info & eti)  Line 102 + 0x16 bytes   C++        gamevc10dbg.exe!boost::archive::detail::archive_serializer_mapboost::archive::binary_oarchive::find(const boost::serialization::extended_type_info & eti)  Line 67        C++        gamevc10dbg.exe!boost::archive::detail::save_pointer_typeboost::archive::binary_oarchive::polymorphic::save<BasePlayer>(boost::archive::binary_oarchive & ar, BasePlayer & t)  Line 435 + 0xe bytes     C++        gamevc10dbg.exe!boost::archive::detail::save_pointer_typeboost::archive::binary_oarchive::save<BasePlayer>(boost::archive::binary_oarchive & ar, const BasePlayer & t)  Line 460 + 0xd bytes       C++        gamevc10dbg.exe!boost::archive::detail::save_pointer_typeboost::archive::binary_oarchive::invoke(boost::archive::binary_oarchive & ar, BasePlayer * const t)  Line 473 + 0xd bytes C++        gamevc10dbg.exe!boost::archive::save(boost::archive::binary_oarchive & ar, BasePlayer * const & t)  Line 525 + 0xf bytes   C++        gamevc10dbg.exe!boost::archive::detail::common_oarchiveboost::archive::binary_oarchive::save_override(BasePlayer * const & t, int __formal)  Line 69 + 0x15 bytes   C++        gamevc10dbg.exe!boost::archive::basic_binary_oarchiveboost::archive::binary_oarchive::save_override(BasePlayer * const & t, int version)  Line 76        C++        gamevc10dbg.exe!boost::archive::binary_oarchive_impl

::save_override(BasePlayer * & t, int __formal)  Line 52      C++        gamevc10dbg.exe!boost::archive::detail::interface_oarchiveboost::archive::binary_oarchive::operator<<(BasePlayer * & t)  Line 64   C++        gamevc10dbg.exe!saveGame()  Line 63 + 0x12 bytes        C++        gamevc10dbg.exe!SDL_main(int argc, char * * argv)  Line 1517 + 0x5 bytes        C++        gamevc10dbg.exe!_main()  + 0xfd bytes   C        gamevc10dbg.exe!_WinMain@16()  + 0x1cd bytes    C        gamevc10dbg.exe!__tmainCRTStartup()  Line 547 + 0x2c bytes      C        gamevc10dbg.exe!WinMainCRTStartup()  Line 371   C        kernel32.dll!75451194()        [Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll]        ntdll.dll!76fbb429()        ntdll.dll!76fbb3fc()        gamevc10dbg.exe!__CT??_R0?AVbad_cast@std@@@8??0bad_cast@std@@QAE@ABV01@@Z12()  + 0xd2ce bytes C++        003426e2()

does any one know whats wrong? I have no idea how to solve this, i have tried everything! i should have all BOOST_CLASS_EXPORT_GUID in place. thx