[Plugin: iPhone, Android and WP7 Native Mobile Apps by UppSite] Error with Plugin

hello,
I’ve using UppSite for a few days now and i got after my activation two warnings:

Warning: simplexml_load_file(http://api.uppsite.com/preferences.php?sid=3) [function.simplexml-load-file]: failed to open stream: HTTP request failed! HTTP/1.0 403 Forbidden in /home/.sites/587/site2101/web/wp-content/plugins/app-your-wordpress-uppsite/uppsite.php on line 146

Warning: simplexml_load_file() [function.simplexml-load-file]: I/O warning : failed to load external entity “http://api.uppsite.com/preferences.php?sid=3” in /home/.sites/587/site2101/web/wp-content/plugins/app-your-wordpress-uppsite/uppsite.php on line 146

Why did i get these errors?

http://ww.wp.xz.cn/extend/plugins/app-your-wordpress-uppsite/