https://svn.boost.org/trac10/ticket/2933 <p> I hope it's just my lack of knowledge that is the cause of this assertion, but I have reduced the test to pretty minimal example ( attached ) and it seems it 'should' work ? </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/2933 Trac 1.4.3 Artur K. <nemerle5@…> Fri, 10 Apr 2009 12:08:09 GMT https://svn.boost.org/trac10/ticket/2933 https://svn.boost.org/trac10/ticket/2933 <ul> <li><strong>attachment</strong> → <span class="trac-field-new">SerializationError.cpp</span> </li> </ul> Ticket Robert Ramey Fri, 10 Apr 2009 17:22:21 GMT https://svn.boost.org/trac10/ticket/2933#comment:1 https://svn.boost.org/trac10/ticket/2933#comment:1 <ul> <li><strong>status</strong> <span class="trac-field-old">new</span> → <span class="trac-field-new">closed</span> </li> <li><strong>resolution</strong> → <span class="trac-field-new">invalid</span> </li> </ul> <p> User error </p> <p> serialization of B doesn't explicitly refer to class C - only it's base Real Base. </p> <p> Try adding </p> <p> #include "boost/serialization/export.hpp" </p> <p> BOOST_CLASS_EXPORT(C); </p> Ticket