Fatal error: Uncaught Error: Call to undefined function is_admin() in C:\xampp\htdocs\wp-content\plugins\admin-menu-editor-pro\modules\highlight-new-menus\plugin.php:13 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\admin-menu-editor-pro\modules\highlight-new-menus\plugin.php on line 13