class-wp-hook.php on line 286 error

Hi

Every time anyone opens checkout page, the same errors appears:
PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘custom_override_default_address_fields’ not found or invalid function name in /home/letterli/public_html/wp-includes/class-wp-hook.php on line 286

PHP Warning: uasort() expects parameter 1 to be array, null given in /home/letterli/public_html/wp-content/plugins/woocommerce/includes/class-wc-countries.php on line 710

I already deactivated one by one the plugins to be sure if one of them was having troubles and i still get this warning.
The checkout page crashes from time to time, many clients says that it just stucks on loading.

I fond out that it is theme issue, but I couldn’t find the solution.

Please, help

Hello,

Please deactivate all the plugins not related to the theme and switch the parent theme, leave the plugins not activated and provide the site admin access to the private area. Please confirm the permit to check the issue on the Storefront theme.

Best Regards

I confirm the permit to check the issue.

Hello,

Please update the theme to 4.0.4, please take into consideration these tips https://xtemos.com/docs/woodmart/faq-guides/3-x-4-0-migration-guide/.

In addition please update the related plugins, first of all, Woocommerce.

Best Regards

[Author]

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