On Jan 20, 2006, at 5:04 AM, Joćo Orvalho wrote: Hi, I am using boost 1.33.1 with Visual C++ 2002 (v 7.0.9466) and Windows XP (no service pack). I was doing some experiments with boost Graph library . When running the program i get the following error on add_edge(): I don't have Visual C++ handy, but your program is correct. We have not tested the Boost Graph Library with managed C++ at all; can you build your program as non-managed code to see if that's the problem? Doug