problems with installation

Hello, I got the following message as answer to

<?php
require_once 'System.php';
var_dump(class_exists('System', false));
?>

Warning: require_once(): open_basedir restriction in effect. 
File(/usr/share/pear/System.php) is not within the allowed path(s): 
(/var/www/vhosts/domain/subdomains/server2/httpdocs/:/tmp/) in 
/var/www/vhosts/domain/subdomains/server2/httpdocs/chkpear.php on line 2 
Warning: require_once(/usr/share/pear/System.php): failed to open 
stream: Operation not permitted in 
/var/www/vhosts/domain/subdomains/server2/httpdocs/chkpear.php on line 2 
Fatal error: require_once(): Failed opening required 'System.php' 
(include_path='.:/usr/share/pear') in 
/var/www/vhosts/domain/subdomains/server2/httpdocs/chkpear.php on line 2

the path is usr/share/pear/ where I see the System.php

I don't understand, where I did something wrong.

Thanks for helping me.
Verena

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