Hello, @Kstb1979,
Please make sure that you have properly created the cart and checkout page on your site and set those pages from WooCommerce >> Settings >> Advanced: https://postimg.cc/LgfBJ9yZ
If you did not create those pages then please go to WooCommerce >> Status >> Tools and “Create default WooCommerce pages” from there: https://postimg.cc/hJzJDCZX
Hope this will solve your issue and if not then please share your site WP-ADMIN Login details in the below-listed format in a private content area of this topic on which you are facing the issue so that we’ll check and assist you accordingly.
WP Admin URL:
WP Admin Username:
WP Admin Password:
Note: Kindly take a complete backup of your site first.
And I also need your permission to debug your site, which includes deactivating all the third-party plugins and on-site Customization as well.
Regards 8Themes Team.