[Boost-users] input stream error exception during deserializing

I am using xml_oarchive/iarchive to serialize and deserialize a graph. I can serialize successfully but cant deserialize from the output file. An exception of input stream error is throwed out when I deserialize from the file. I paste a small program which can reproduce the problem [here] (http://www.rapidshare.com.cn/jHQIrOv). How could I solve the problem. Thx in advance.