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

Warning: fopen(http://blizejnatury.ndl.pl/rss/news/feed.xml) [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.