Warning: Uncaught Exception: Warning: require(/var/www/html/pub/errors/503.php): failed to open stream: No such file or directory in /var/www/html/vendor/magento/framework/Session/SaveHandler/Redis.php on line 97 in /var/www/html/vendor/magento/framework/App/ErrorHandler.php:61 Stack trace: #0 /var/www/html/vendor/magento/framework/Session/SaveHandler/Redis.php(97): Magento\Framework\App\ErrorHandler->handler(2, 'require(/var/ww...', '/var/www/html/v...', 97, Array) #1 /var/www/html/vendor/magento/framework/Session/SaveHandler/Redis.php(97): require() #2 /var/www/html/vendor/magento/framework/Session/SaveHandler.php(139): Magento\Framework\Session\SaveHandler\Redis->read('bgod82q5ivocq09...') #3 /var/www/html/vendor/magento/framework/Session/SaveHandler.php(84): Magento\Framework\Session\SaveHandler->callSafely('read', 'bgod82q5ivocq09...') #4 [internal function]: Magento\Framework\Session\SaveHandler->read('bgod82q5ivocq09...') #5 /var/www/html/vendor/magento/framework/Session/SessionManager.php(204): session_start() in /var/www/html/vendor/magento/framework/App/ErrorHandler.php on line 61

Fatal error: Magento\Framework\Session\SaveHandler\Redis::read(): Failed opening required '/var/www/html/pub/errors/503.php' (include_path='/var/www/html/generated/code:/var/www/html/generated/code:/var/www/html/vendor/magento/zendframework1/library:.:/usr/share/php') in /var/www/html/vendor/magento/framework/Session/SaveHandler/Redis.php on line 97

Fatal error: Uncaught Exception: Warning: Unknown: Cannot call session save handler in a recursive manner in Unknown on line 0 in /var/www/html/vendor/magento/framework/App/ErrorHandler.php:61 Stack trace: #0 [internal function]: Magento\Framework\App\ErrorHandler->handler(2, 'Unknown: Cannot...', 'Unknown', 0, NULL) #1 {main} thrown in /var/www/html/vendor/magento/framework/App/ErrorHandler.php on line 61