Hi! Could anyone please help me out with the following error? : error LNK2019: unresolved external symbol "void __cdecl boost::assertion_failed(char const *,char const *,char const *,long)" (?assertion_failed@boost@@YAXPBD00J@Z) referenced in function "public: void __thiscall boost::detail::basic_timed_mutex::lock(void)" (?lock@basic_timed_mutex@detail@boost@@QAEXXZ) Thanks in Advance! Joseph A. Marks PHONE: 612-788-9658 e-mail: josephamarks@yahoo.com