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 99 in /var/www/html/vendor/magento/framework/App/ErrorHandler.php:61 Stack trace: #0 /var/www/html/vendor/magento/framework/Session/SaveHandler/Redis.php(99): Magento\Framework\App\ErrorHandler->handler(2, 'require(/var/ww...', '/var/www/html/v...', 99, Array) #1 /var/www/html/vendor/magento/framework/Session/SaveHandler/Redis.php(99): require() #2 /var/www/html/vendor/magento/framework/Session/SaveHandler.php(138): Magento\Framework\Session\SaveHandler\Redis->read('9e99e09a2cd4bca...') #3 /var/www/html/vendor/magento/framework/Session/SaveHandler.php(83): Magento\Framework\Session\SaveHandler->callSafely('read', '9e99e09a2cd4bca...') #4 [internal function]: Magento\Framework\Session\SaveHandler->read('9e99e09a2cd4bca...') #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/local/lib/php') in /var/www/html/vendor/magento/framework/Session/SaveHandler/Redis.php on line 99

Fatal error: Uncaught Exception: Warning: session_write_close(): Cannot call session save handler in a recursive manner in /var/www/html/vendor/magento/framework/Session/SessionManager.php on line 151 in /var/www/html/vendor/magento/framework/App/ErrorHandler.php:61 Stack trace: #0 [internal function]: Magento\Framework\App\ErrorHandler->handler(2, 'session_write_c...', '/var/www/html/v...', 151, Array) #1 /var/www/html/vendor/magento/framework/Session/SessionManager.php(151): session_write_close() #2 [internal function]: Magento\Framework\Session\SessionManager->writeClose() #3 {main} thrown in /var/www/html/vendor/magento/framework/App/ErrorHandler.php on line 61