Hi,
It is a Amazing plugin, helps me setup weight based,speed based(2 days, 3-8 days) shipping method till last night, When i was adding additional shipping method, I got this error message, I can't add any shipping classes, after adding classes, the last column ?(information on hover question mark) won't show any information. When i click save changes button, I got this error message.Action failed.Please refresh the page and retry
https://wordpress.org/plugins/weight-country-woocommerce-shipping/