Fatal error: Uncaught Error: Call to undefined function wp_is_json_request() in /wp-includes/functions.php:3712 Stack trace: #0 /wp-includes/functions.php(5412): wp_die('<h1>Error estab...', 'Database Error') #1 /wp-includes/load.php(422): dead_db() #2 /wp-settings.php(110): wp_set_wpdb_vars() #3 /wp-config.php(89): require_once('/wp-settings.ph...') #4 /wp-load.php(37): require_once('/wp-config.php') #5 /wp-blog-header.php(13): require_once('/wp-load.php') #6 /index.php(17): require('/wp-blog-header...') #7 {main} thrown in /wp-includes/functions.php on line 3712