Fatal error: Uncaught Error: Call to a member function add_query_var() on string in /var/www/web12/html/zap-metzler/wp-includes/class-wp-taxonomy.php:503 Stack trace: #0 /var/www/web12/html/zap-metzler/wp-includes/taxonomy.php(533): WP_Taxonomy->add_rewrite_rules() #1 /var/www/web12/html/zap-metzler/wp-includes/taxonomy.php(63): register_taxonomy('category', 'post', Array) #2 /var/www/web12/html/zap-metzler/wp-settings.php(513): create_initial_taxonomies() #3 /var/www/web12/html/zap-metzler/wp-config.php(111): require_once('/var/www/web12/...') #4 /var/www/web12/html/zap-metzler/wp-load.php(50): require_once('/var/www/web12/...') #5 /var/www/web12/html/zap-metzler/wp-blog-header.php(13): require_once('/var/www/web12/...') #6 /var/www/web12/html/zap-metzler/index.php(17): require('/var/www/web12/...') #7 {main} thrown in /var/www/web12/html/zap-metzler/wp-includes/class-wp-taxonomy.php on line 503