Fatal error: Uncaught Error: Class "Redis" not found in C:\xampp\htdocs\classes\Cache.php:3 Stack trace: #0 C:\xampp\htdocs\classes\User.php(4): include_once() #1 C:\xampp\htdocs\head.php(4): include_once('C:\\xampp\\htdocs...') #2 C:\xampp\htdocs\index.php(1): include('C:\\xampp\\htdocs...') #3 {main} thrown in C:\xampp\htdocs\classes\Cache.php on line 3