Warning: fopen() [function.fopen]: php_network_getaddresses: getaddrinfo failed: Name or service not known in /index.php on line 1224

Warning: fopen(http://www.interperson.pl/index2.php?option=com_rss&feed=RSS2.0&no_html=1) [function.fopen]: failed to open stream: php_network_getaddresses: getaddrinfo failed: Name or service not known in /index.php on line 1224
Error reading RSS data.