Fatal error: Uncaught Error: Class 'Redis' not found in /var/www/html/app/lib/core/Cache/ExternalCache.php:242 Stack trace: #0 /var/www/html/app/lib/core/Cache/ExternalCache.php(194): ExternalCache::getRedisObject() #1 /var/www/html/app/lib/core/Cache/ExternalCache.php(52): ExternalCache::getCacheObject() #2 /var/www/html/app/lib/core/Cache/ExternalCache.php(137): ExternalCache::init() #3 /var/www/html/app/lib/core/Configuration.php(985): ExternalCache::contains('ConfigurationCa...') #4 /var/www/html/app/lib/core/Configuration.php(146): Configuration::loadConfigCacheInMemory() #5 /var/www/html/app/lib/core/Configuration.php(102): Configuration->__construct('/var/www/html/a...', true, false, false) #6 /var/www/html/app/lib/core/Db.php(100): Configuration::load() #7 /var/www/html/index.php(43): Db->__construct(NULL, NULL, false) #8 {main} thrown in /var/www/html/app/lib/core/Cache/ExternalCache.php on line 242