Photoxhibit issue

Hi,
right after installing photoxhibit latest version i have no errors in the plugins page.
As soon as i go to the main photoxhibit page i see these two lines:

Warning: get_pagepart(pages/parts/usage.php) [function.get-pagepart]: failed to open stream: No such file or directory in /web/htdocs/www.cmmilanese.it/home/it/wp-content/plugins/photoxhibitt/common/inc/px.php on line 774

Warning: get_pagepart() [function.include]: Failed opening ‘pages/parts/usage.php’ for inclusion (include_path=’.:/php/lib/php/’) in /web/htdocs/www.cmmilanese.it/home/it/wp-content/plugins/photoxhibitt/common/inc/px.php on line 774

And the same error, on different lines shows up when i move to the other photoxhibit pages.
Any clue?

Thanks!