Hi, I got some problems trying to compile a topological sort code. I created my graph with the color properties but I got the error: error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'boost::detail::error_property_not_found' (or there is no acceptable conversion) So, I tried the example at boost_1_46_1\libs\graph\example\topo_sort.cpp. It works fine, but with a little change I could reproduce the error. I change the following code at line 43: typedef adjacency_list<vecS, vecS, directedS, property<vertex_color_t, default_color_type> > Graph; to typedef adjacency_list<vecS, listS, directedS, property<vertex_color_t, default_color_type> > Graph; Should the vertex list selector influence on that? I tried Boost 1.46.1 and got the error with both compilers: Microsot Visual Studio 2008 version 9.0.21022.8 RTM and Intel® C++ Compiler Version 11.1.850.2008 I attached the modified version of the file. With Kind Regards, Bruno