Fatal error: Uncaught Error: Call to undefined function sanitize_title_with_dashes() in /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-includes/class-wp-taxonomy.php:290
Stack trace:
#0 /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-includes/class-wp-taxonomy.php(230): WP_Taxonomy->set_props()
#1 /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-includes/taxonomy.php(426): WP_Taxonomy->__construct()
#2 /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-includes/taxonomy.php(79): register_taxonomy()
#3 /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-settings.php(330): create_initial_taxonomies()
#4 /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-config.php(80): require_once('/var/www/vhosts...')
#5 /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-load.php(37): require_once('/var/www/vhosts...')
#6 /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-blog-header.php(13): require_once('/var/www/vhosts...')
#7 /var/www/vhosts/letteboer.nl/markslagaccountants.nl/index.php(17): req in /var/www/vhosts/letteboer.nl/markslagaccountants.nl/wp-includes/class-wp-taxonomy.php on line 290