WooCommerece checkout "Internal Error"

[32toss]

I am using an up to date X theme. My Plugins all seem to be up to date. Contacted my provider who gave me the error:

This is an error:

[15-Jun-2018 18:10:43 America/Chicago] PHP Fatal error: Uncaught Error: Call to undefined method WC_Customer::get_order_country() in /home3/strothe2/public_html/vavipers/wp-content/plugins/woocommerce/includes/class-wc-checkout.php:672
Stack trace:
#0 /home3/strothe2/public_html/vavipers/wp-content/plugins/woocommerce/includes/class-wc-checkout.php(736): WC_Checkout->validate_posted_data(Array, Object(WP_Error))
#1 /home3/strothe2/public_html/vavipers/wp-content/plugins/woocommerce/includes/class-wc-checkout.php(1022): WC_Checkout->validate_checkout(Array, Object(WP_Error))
#2 /home3/strothe2/public_html/vavipers/wp-content/plugins/woocommerce/includes/class-wc-ajax.php(435): WC_Checkout->process_checkout()
#3 /home3/strothe2/public_html/vavipers/wp-includes/class-wp-hook.php(286): WC_AJAX::checkout(’’)
#4 /home3/strothe2/public_html/vavipers/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(’’, Array)
#5 /home3/strothe2/public_html/vavipers/wp-includes/plugin.php(453): WP_Hook->do_action(Array)
#6 /home3/strothe2/public_html/vavipers/wp-content/plugins/w in /home3/strothe2/public_html/vavipers/wp-content/plugins/woocommerce/includes/class-wc-checkout.php on line 672

[friech]

Hi There,

Thank you for writing in, first please clear all your site’s caching feature (plugin, server-side, CDN, and browser’s cache) to make sure that your site is not serving a cached file. This will help you to avoid any potential errors.

If that does not work please do a test for a plugin conflict. You can do this by deactivating all third-party plugins, and see if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.

If the issue persists, please provide us login credentials (wp-admin and ftp) in a secure note, so we can take a closer look.

Cheers!