Sohail,
Might be a long shot, but are you sure you've done this throughout your code:
http://www.boost.org/libs/serialization/doc/special.html#export
Yes, all done. The failing code is _after_ the check for unregistered classes. No exception is thrown, but the assert() is triggered. BTW here's the general form as I outlined a few weeks back: Can you see any problems. //---------header file----------- // example derived serializable class class derived : public base { std::string m_name; friend class boost::serialization::access; template<class Archive> void serialize(Archive &ar, const unsigned int /*version*/) { // serialize base class ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(base); // handle any members in derived ar & BOOST_SERIALIZATION_NVP(m_name); } public: derived() {} }; // ensure correct ID generation when saving via base* // if this is omitted you'll get an unregistered exception unless // you register each class directly with the archive BOOST_CLASS_EXPORT_GUID(derived,"derived") //--------------/header file---------------