Actually, it just looks like VBA is one of the many things failing as that's just a tail, there's probably other stuff before it dying as well.
Add in: define('DISABLE_HOOKS', true);
just under the first line of the config.php file, which should be: <?php
If your forum basically works (basically as in no mods are running, so it'll probably look a bit messed up, but it WORKS), then you know it's probably a mod issue.
From there, disable a few mods at a time, remove the disable hooks and see if your site continues to work. Once it breaks, you know you just enabled the problem mod. Then you should be able to find out which one is causing you issues.