Fatal error: Uncaught Error: Class 'Redis' not found in /var/www/html/system/library/session/redis.php:17 Stack trace: #0 /var/www/html/system/library/session.php(29): Session\Redis->__construct(Object(Registry)) #1 /var/www/html/system/framework.php(88): Session->__construct('redis', Object(Registry)) #2 /var/www/html/system/startup.php(88): require_once('/var/www/html/s...') #3 /var/www/html/index.php(37): start('catalog') #4 {main} thrown in /var/www/html/system/library/session/redis.php on line 17