Uncaught TypeError: a.cookie is not a function
at HTMLDocument. (cart-fragments.min.js?ver=2.6.14:1)
at i (jquery.js?ver=1.12.4:2)
at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4:2)
at Function.ready (jquery.js?ver=1.12.4:2)
at HTMLDocument.K (jquery.js?ver=1.12.4:2)
It’s not your fault or your theme, it’s related to WooCommerce. They have changed from jQuery Cookie to Vanilla JS Cookie https://github.com/js-cookie/js-cookie in to work with latest version of jQuery in WordPress 4.9+. The updated file is cart-fragments.min.js but tthe minified file (.min.js) is not re-minified. Only the raw file cart-fragments.js has the new code. To fix this error, you can open /woocommerce/assets/js/frontend/cart-fragments.js , copy all the code, and open an online minify tool such as https://www.minifier.org/ to get the minified code. Copy the minified code and replace all code in the .min.js file. Voala, it should work the issue.
An easier option: wait for WooCommerce to update 😉