Error when I click on add to cart after latest update

Hello,

I updated Woocommerce to the latest version 2.0.7 last night.

I get the feeling net may have dropped out when it was updating.

I was able to copy accross some files to fix most the errors. However I have this one here which I don’t know how to fix.

When I click on add to cart:

Fatal error: Class ‘WC_Validation’ not found in /home/aimresum/public_html/wp-content/plugins/woocommerce/woocommerce.php on line 1317

Lines 1316 – 1318

public function validation() {
return new WC_Validation();
}

Link to a product to view error when you click on add to cart.
https://aimresume.com.au/?product=upload-job-advertisment

https://www.ads-software.com/extend/plugins/woocommerce/