I am trying to convert several polyface meshes into a 3d solid. I can covert a regular mesh into a solid but for the life of me I can't firgure out why the polyface mesh won't do it. Please Help

See the options in the tip:
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=5117

I tried that already. It didn't work for me. I'm new at this...Is there a way I can upload my dwg?