Internal Server Error

SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known

/home/krmdg02qpye6/public_html/CFV/lib/db/sql.php:0 PDO->__construct()/home/krmdg02qpye6/public_html/CFV/index.php:27 DB\SQL->__construct('mysql:host=cfvrewards.db.9556095.hostedresource.com;port=3306;dbname=cfvrewards','cfvrewards','Q!w2E#r4')