Fatal error: Uncaught CredisException: Lost connection to Redis server. in /var/project/magento_app/vendor/colinmollenhour/credis/Client.php:1239 Stack trace: #0 /var/project/magento_app/vendor/colinmollenhour/credis/Client.php(964): Credis_Client->read_reply('select') #1 /var/project/magento_app/vendor/colinmollenhour/credis/Client.php(619): Credis_Client->__call('select', Array) #2 /var/project/magento_app/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php(359): Credis_Client->select(1) #3 /var/project/magento_app/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php(238): Cm_Cache_Backend_Redis->_applyClientOptions(Object(Credis_Client)) #4 /var/project/magento_app/vendor/magento/zendframework1/library/Zend/Cache.php(153): Cm_Cache_Backend_Redis->__construct(Array) #5 /var/project/magento_app/vendor/magento/zendframework1/library/Zend/Cache.php(94): Zend_Cache::_makeBackend('Cm_Cache_Backen...', Array, true, true) #6 /var/project/magento_app/vendor/magento/framework/App/Cache/Frontend in /var/project/magento_app/vendor/colinmollenhour/credis/Client.php on line 1239