This thread is resolved. Here is a description of the problem and solution.
Problem:
An error of type E_ERROR was caused in line 234 of the file wp-content/plugins/woocommerce/includes/class-wc-post-types.php. Error message: Uncaught ValueError: Missing format specifier at end of string in wp-content/plugins/woocommerce/includes/class-wc-post-types.php:234
Error Details
=============
An error of type E_ERROR was caused in line 234 of the file /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-content/plugins/woocommerce/includes/class-wc-post-types.php. Error message: Uncaught ValueError: Missing format specifier at end of string in /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-content/plugins/woocommerce/includes/class-wc-post-types.php:234
Stack trace:
#0 /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-content/plugins/woocommerce/includes/class-wc-post-types.php(234): sprintf('Alle %', 'Kleur arm')
#1 /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-includes/class-wp-hook.php(307): WC_Post_Types::register_taxonomies('')
#2 /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#3 /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#4 /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-settings.php(598): do_action('init')
#5 /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-config.php(118): require_once('/customers/d/4/...')
#6 /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-load.php(50): require_once('/customers/d/4/...')
#7 /customers/d/4/f/ergorest-armsteunen.nl/httpd.www/wordpress/wp-admin/admin-ajax.php(22): require_once('/customers/d/4/...')
#8 {main}
thrown