Fatal error: Uncaught exception Exception with message Could not connect to database (php_network_getaddresses: getaddrinfo failed: Name or service not known) thrown in /var/www/html/system/libraries/Database.php on line 78

#0 /var/www/html/system/libraries/Database.php(135): Database->__construct()
#1 [internal function]: Database::getInstance()
#2 /var/www/html/system/libraries/System.php(170): call_user_func(Array)
#3 /var/www/html/system/libraries/Model.php(86): System->import('Database')
#4 /var/www/html/system/modules/frontend/FrontendUser.php(91): Model->__construct()
#5 /var/www/html/system/modules/frontend/FrontendUser.php(173): FrontendUser->__construct()
#6 [internal function]: FrontendUser::getInstance()
#7 /var/www/html/system/libraries/System.php(170): call_user_func(Array)
#8 /var/www/html/index.php(65): System->import('FrontendUser', 'User')
#9 /var/www/html/index.php(400): Index->__construct()
#10 {main}