Not showing shipping methods

Hello,
About a week ago, I found this plugin called “WooCommerce weight based shipping” since I wanted a weight based shipping. Things were working fine. Today, I tried finalizing my shipping and I got this message on the cart page: https://i.piju.me/o88Z4P1.png

So I decided to disable the plugin and try normally adding zones and shipping methods, still no luck. The same message was still showing up. I’ve spent hours searching for a possible solution to this problem but no luck.

Can anyone help me? Thanks in advance.

The page I need help with: [log in to see the link]