One thing I can see wrong on this page is the name of one of the file fields has a space at the beginning. Change:
<input name=" RulesRegs" type="file" id=" RulesRegs" size="35" />
to:
<input name="RulesRegs" type="file" id="RulesRegs" size="35" />
If that does not resolve the problem, we will need to determine which of the file uploads is causing the error.
Remove the file upload server behaviors from the page on at a time to narrow down which one is causing the error, once we know that, we will have a better place to begin looking into the cause.