Ocorreu um erro ao conectar o banco

exception 'Exception' with message 'php_network_getaddresses: getaddrinfo failed: Name or service not known' in /home/storage/6/8b/4b/supreloja1/public_html/AppCode/biblioteca/classes/componentes/DB.class.php:57
Stack trace:
#0 /home/storage/6/8b/4b/supreloja1/public_html/AppCode/biblioteca/classes/componentes/DB.class.php(96): DB->_connect()
#1 /home/storage/6/8b/4b/supreloja1/public_html/AppCode/biblioteca/classes/dao/ProdutosDao.class.php(99): DB->prepare(' SELECT ID, DES...')
#2 /home/storage/6/8b/4b/supreloja1/public_html/AppCode/biblioteca/classes/controller/SiteController.class.php(3725): ProdutosDao->selecionaId('282')
#3 /home/storage/6/8b/4b/supreloja1/public_html/AppCode/biblioteca/classes/controller/SiteController.class.php(2273): SiteController->mostrarProdutoInd('282')
#4 /home/storage/6/8b/4b/supreloja1/public_html/site/itens/index.php(6): SiteController->mostrarItensSeg('7', '282', '')
#5 {main}