Fatal error: Uncaught Error: Class "Zend_Cache_Backend" not found in /var/www/html/magento2/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php:39 Stack trace: #0 /var/www/html/magento2/vendor/composer/ClassLoader.php(576): include() #1 /var/www/html/magento2/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}() #2 [internal function]: Composer\Autoload\ClassLoader->loadClass() #3 /var/www/html/magento2/vendor/magento/framework/App/Cache/Frontend/Factory.php(299): class_exists() #4 /var/www/html/magento2/vendor/magento/framework/App/Cache/Frontend/Factory.php(148): Magento\Framework\App\Cache\Frontend\Factory->_getBackendOptions() #5 /var/www/html/magento2/vendor/magento/framework/App/Cache/Frontend/Pool.php(69): Magento\Framework\App\Cache\Frontend\Factory->create() #6 /var/www/html/magento2/vendor/magento/framework/App/Cache/Frontend/Pool.php(156): Magento\Framework\App\Cache\Frontend\Pool->_initialize() #7 /var/www/html/magento2/vendor/magento/framework/App/Cache/Type/FrontendPool.php(87): Magento\Framework\App\Cache\Frontend\Pool->get() #8 /var/www/html/magento2/vendor/magento/framework/App/Interception/Cache/CompiledConfig.php(29): Magento\Framework\App\Cache\Type\FrontendPool->get() #9 /var/www/html/magento2/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php(121): Magento\Framework\App\Interception\Cache\CompiledConfig->__construct() #10 /var/www/html/magento2/vendor/magento/framework/ObjectManager/Factory/Compiled.php(108): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject() #11 /var/www/html/magento2/vendor/magento/framework/ObjectManager/ObjectManager.php(70): Magento\Framework\ObjectManager\Factory\Compiled->create() #12 /var/www/html/magento2/vendor/magento/framework/App/ObjectManager/Environment/Compiled.php(117): Magento\Framework\ObjectManager\ObjectManager->get() #13 /var/www/html/magento2/vendor/magento/framework/App/ObjectManagerFactory.php(191): Magento\Framework\App\ObjectManager\Environment\Compiled->configureObjectManager() #14 /var/www/html/magento2/vendor/magento/framework/App/Bootstrap.php(212): Magento\Framework\App\ObjectManagerFactory->create() #15 /var/www/html/magento2/vendor/magento/framework/App/Bootstrap.php(127): Magento\Framework\App\Bootstrap->__construct() #16 /var/www/html/magento2/pub/index.php(31): Magento\Framework\App\Bootstrap::create() #17 {main} thrown in /var/www/html/magento2/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php on line 39