Variations – cant select or add to cart

Hello, variations don’t work. – The add to cart button is grayed out, and the variation select dropdownmenu is not populated.

I tried fixing it as it says here: https://docs.woothemes.com/document/variable-product/ but I don’t see any javacript problems. I also tried with Storefront theme and it didn’t work.

Can you help please? Do I need to click that items are in stock somewhere?

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