Error on Live server

Hello,
I am new to CodeIgniter. I went through the onlinre tutorials and developed a simple website on localhost. it works fine on localhost,, but I got the error below when I hosted the website in a live server.


A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257

I went through the config files, but to no avail. Please someone should hellp me out.

Thanks.