Okay, the error in your template is very simple.
Find this small section of the template ;
Code:
<!-- Todays active users -->
</if>
<!-- Start vBChat Users -->
and remove the hilighted "</if>".
The reason it's there is because you didn't quite follow the instructions (because in fact you couldn't). The instructions include replacing a block of code which finishes with an </if> with another block of code that also ends with an </if>. However, because you have already hacked your template for vbchat, that exact block of code wasn't there to remove - so it looks like you removed what you could find - but as a result you ended up adding an extra </if>. As a result, I have actually changed the instructions so that this tiny mistake should not be made by anyone else who has a previously hacked template.
I have e-mailed you a working homeindex.php