It seems your include path is not set or ini_set.

Try reuploading

include/vshare.php
include/PEAR - all files inside the folder, make sure folder name PEAR in all CAPS.

If that doesn't work, add following code into phpinfo file, and see the value of include_path

Code:
<?php 
$pear_path = '/var/www/web0/html/include/PEAR/';
set_include_path($pear_path . PATH_SEPARATOR . get_include_path());
phpinfo(); 
?>