Error message

• Warning: file_get_contents(): php_network_getaddresses: getaddrinfo failed: Name or service not known in eval() (line 13 of /var/www/html/drupal-7.22/modules/php/php.module(80) : eval()'d code).
• Warning: file_get_contents(http://test.syshotelonline.it/login_drupal.php?tentativi=0): failed to open stream: php_network_getaddresses: getaddrinfo failed: Name or service not known in eval() (line 13 of /var/www/html/drupal-7.22/modules/php/php.module(80) : eval()'d code).