i think the validation is failing on the file field.
Change the following line of code:
$WAFV_Errors .= WAValidateRQ((isset($_POST["fieldset_group_Upload_File"])?$_POST["fieldset_group_Upload_File"]:"") . "",true,1);
to:
$WAFV_Errors .= WAValidateRQ((isset($_FILES["fieldset_group_Upload_File"])?$_FILES["fieldset_group_Upload_File"]:"") . "",true,1);