Fatal error: Uncaught Error: Call to undefined function wp_is_valid_utf8() in /customers/b/7/7/dkej.dk/httpd.www/wp-includes/formatting.php:2287
Stack trace:
#0 /customers/b/7/7/dkej.dk/httpd.www/wp-includes/class-wp-taxonomy.php(378): sanitize_title_with_dashes('category_name')
#1 /customers/b/7/7/dkej.dk/httpd.www/wp-includes/class-wp-taxonomy.php(290): WP_Taxonomy->set_props('post', Array)
#2 /customers/b/7/7/dkej.dk/httpd.www/wp-includes/taxonomy.php(532): WP_Taxonomy->__construct('category', 'post', Array)
#3 /customers/b/7/7/dkej.dk/httpd.www/wp-includes/taxonomy.php(63): register_taxonomy('category', 'post', Array)
#4 /customers/b/7/7/dkej.dk/httpd.www/wp-settings.php(513): create_initial_taxonomies()
#5 /customers/b/7/7/dkej.dk/httpd.www/wp-config.php(108): require_once('/customers/b/7/...')
#6 /customers/b/7/7/dkej.dk/httpd.www/wp-load.php(51): require_once('/customers/b/7/...')
#7 /customers/b/7/7/dkej.dk/httpd.www/wp-blog-header.php(13): require_once('/customers/b/7/...')
#8 /customers/b/7/7/dkej.dk/httpd.www/index.php(17): require('/customers/b/7/...')
#9 {main}
  thrown in /customers/b/7/7/dkej.dk/httpd.www/wp-includes/formatting.php on line 2287