Hi There,
I used AVS too a little while ago, and I ran into compatibility problems like this too..
I don't know which Gamemode you are using, but you can start your search there..
Just CTRL+F and type the exact message, or a part of it there.
If you really can't find anything in there, then try disabling all filterscripts you have, but not the AVS script, and see if it works.
İf this doesn't work too, then try using it with the Grand Larcency gamemode, and see what happens

Also, check that you have all plugins necasary(if needed, can't remember that).
İ assume you also created all folders in de "scriptfiles" folder.
Good luck, and let's hope this solves your problem