Fatal error: Uncaught Error: Call to undefined function is_mobile() in /home/kobayang10/www/sausage/wp_kanri/wp-content/themes/sausage_new/404.php:3 Stack trace: #0 /home/kobayang10/www/sausage/wp_kanri/wp-includes/template-loader.php(74): include() #1 /home/kobayang10/www/sausage/wp_kanri/wp-blog-header.php(19): require_once('/home/kobayang1...') #2 /home/kobayang10/www/sausage/index.php(17): require('/home/kobayang1...') #3 {main} thrown in /home/kobayang10/www/sausage/wp_kanri/wp-content/themes/sausage_new/404.php on line 3