Upgrading from 2.0.8.c to 2.0.8e --> Fatal Error helper.php on line 106

[adieterich]

Please:

I need some help to resolve this issue.
Today I have installed a upgrade my  store from 2.0.8.c to 2.0.8e using Virtuemart-aio live update, and after that, my frontpage, where I have a module with VM Featured Products, start to fail showing the following error:

Fatal error: Call to undefined method shopFunctionsF::getAddToCartButton() in /home2/artimedc/public_html/joomla2/modules/mod_virtuemart_product/helper.php on line 106

If I un-select to don't show this module on the frontpage, the website load fine.

Any suggestion to fix it?
I have to say that I'm not an expert on Php...

More details:
Joomla Version:2.5.6
PHP VersioN:    5.3.10

Thanks in advance!!