Loading error

[eluser]emperius[/eluser]
I created a site on a local server and when I tried to move it to the hosting I get this error

A PHP Error was encountered

Severity: Notice

Message: Undefined property: CI_Loader::$load

Filename: helpers/application_helper.php

Line Number: 12


on line 12 in the application helper I try to load session library
$this->load->library('session');

What could be a problem?

I just noticed that I was testing on PHP4 server but hosting has PHP 5