I removed the extra BOOST_CLASS_EXPORT_GUID(bus_stop, "bus_stop"), and unfortunately, it core dumped in the same place. Wayne Liu ---- original message ---- Date: Mon, 27 Mar 2006 08:15:35 -0800 From: "Robert Ramey" <ramey@rrsd.com> Subject: Re: [Boost-users] Serialization library question To: boost-users@lists.boost.org Message-ID: <e09334$60o$1@sea.gmane.org> This looks like it should work. I'll look at it more carefully later. Note that the BOOST_CLASS_EXPORT_GUID(bus_stop, "bus_stop") should be superfluous since an instance of an abstract class cannot be created. Try removing this and see if it works. Let me know what happens. If that fixes it - I would like to know. Robert Ramey