Warning: file_get_contents() [function.file-get-contents]: http:// wrapper is di

hello, I've bought Catch Box Pro (premium) after working for a while with the non pro edition. After installation, when I'm in the "editing mode" of my website I always have the following message on the very top of the browser: Warning: file_get_contents() [function.file-get-contents]: http:// wrapper is disabled in the server configuration by allow_url_fopen=0 in /home/mhd-01/www.rolfmi.it/htdocs/wp-content/themes/catch-box-pro/update_notifier.php on line 103 Warning: file_get_contents(http://catchthemes.com/update-notifier/catch-box-pro/notifier.xml) [function.file-get-contents]: failed to open stream: no suitable wrapper could be found in /home/mhd-01/www.rolfmi.it/htdocs/wp-content/themes/catch-box-pro/update_notifier.php on line 103 The web appear to work but some of the configurations I'm doing appear not to work. WWW.ROLFMI.it