Error - Missing Argument 4

[mjranim]

Hey,

Joomla 2.5.4
Virtuemart 2.02
PHP 5.3.14
Site:   www.wealthoftheword.org
I get these errors. . .

Warning: Missing argument 4 for plgVmCustomTextinput::plgVmCalculateCustomVariant() in /home/wealthof/public_html/plugins/vmcustom/textinput/textinput.php on line 180

Warning: Missing argument 4 for plgVmCustomStockable::plgVmCalculateCustomVariant() in /home/wealthof/public_html/plugins/vmcustom/stockable/stockable.php on line 477

I also tried to update, but that caused many errors and the site went down completely.

Any help with this would be greatly appreciated.