instapress suddenly disappeared from my sidebar

everything was fine, then i reloaded in order to preview a post and my site failed to load properly in both sidebars and the wordpress admin menu did not appear. i received the following text appeared in the sidebar where my instapress gallery had been:

Warning: require_once(Zend/Loader.php) [function.require-once]: failed to open stream: No such file or directory in /home/stylsot0/public_html/wp-content/plugins/instapress/instagram-php-api/Zend/Uri.php on line 130

Fatal error: require_once() [function.require]: Failed opening required ‘Zend/Loader.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/stylsot0/public_html/wp-content/plugins/instapress/instagram-php-api/Zend/Uri.php on line 130

i deactivated the plugin and now the whole page is loading properly, but i miss my istapress – please help!

thanks!

lvs

http://wordpress.org/extend/plugins/instapress/