Warning: include(/customers/e/0/1/den-hoorn.be/httpd.www/wp-content/plugins/wordpress-seo/inc/class-wpseo-admin-bar-menu.php): Failed to open stream: No such file or directory in /customers/e/0/1/den-hoorn.be/httpd.www/wp-content/plugins/tier-pricing-table/vendor/composer/ClassLoader.php on line 582

Warning: include(): Failed opening '/customers/e/0/1/den-hoorn.be/httpd.www/wp-content/plugins/wordpress-seo/vendor/composer/../../inc/class-wpseo-admin-bar-menu.php' for inclusion (include_path='.:/usr/share/php') in /customers/e/0/1/den-hoorn.be/httpd.www/wp-content/plugins/tier-pricing-table/vendor/composer/ClassLoader.php on line 582

Fatal error: Uncaught Error: Class "WPSEO_Admin_Bar_Menu" not found in /customers/e/0/1/den-hoorn.be/httpd.www/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php:20
Stack trace:
#0 /customers/e/0/1/den-hoorn.be/httpd.www/wp-includes/class-wp-hook.php(324): wpseo_initialize_admin_bar('')
#1 /customers/e/0/1/den-hoorn.be/httpd.www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#2 /customers/e/0/1/den-hoorn.be/httpd.www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#3 /customers/e/0/1/den-hoorn.be/httpd.www/wp-settings.php(717): do_action('wp_loaded')
#4 /customers/e/0/1/den-hoorn.be/httpd.www/wp-config.php(96): require_once('/customers/e/0/...')
#5 /customers/e/0/1/den-hoorn.be/httpd.www/wp-load.php(50): require_once('/customers/e/0/...')
#6 /customers/e/0/1/den-hoorn.be/httpd.www/wp-blog-header.php(13): require_once('/customers/e/0/...')
#7 /customers/e/0/1/den-hoorn.be/httpd.www/index.php(17): require('/customers/e/0/...')
#8 {main}
  thrown in /customers/e/0/1/den-hoorn.be/httpd.www/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 20