Also getting this error. I also get a HTTP Error when I upload png files to media library. Switching themes doesn’t help the main issue, although I haven’t gotten this error message since switching themes (switched today from Royal to Avata).
PHP Fatal error: Call to undefined method WooCommerce::show_messages() in /home/quotequa/public_html/themenumaster.com/wp-content/themes/royal/woocommerce/wishlist.php on line 57
