[Plugin: Woocommerce] TypeError: $(…).on is not a function

Hi I have problem with woocommerce. When I want buy variable product there is missing Add to cart button. When I checked Css there was Display:none so I change it. But there is another problem when I click on button add to cart then I got message please choose product options… . Second thing is that i have error in scripts :

TypeError: $(...).on is not a function
$( document ).on( 'click', '.add_to_cart_button', function() {
Location : plugins/woocommerce/assets/js/frontend/add-to-cart.js?ver=2.1.12

but i don’t know what it means and it’s original file from woocommerce.
I have old version of woocommerce 2.1.12, of course I tried update it but nothing changed. Few days ago : 6.10.2015 it worked ok because I have order from this day.

Please help.

Thank you.