Fatal Error about Smarty

After the installation of vshare, i get the following error while trying to open the admin login page. i.e. http://www.mydomain.com/vshare/admin

Fatal error: main() [function.require]: Failed opening required '/home/mydomain/public_html/vshare/include/smarty/libs/Smarty.class.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/mydomain/public_html/vshare/include/vshare.php on line 26
Can anyone help in this?

Thanxs

Please make sure you have properly uploaded all the files.Transfer mode must be in binary