Problem when moving myweb to web server

[eluser]Nisha S.[/eluser]
Hi,

I am getting the following error message after I have moved my website to my hosting server.

Fatal error: Call to undefined method CI_Validation::error_string() in /home/sparthee/public_html/e02tamils/test/system/helpers/form_helper.php on line 837

But the same thing works fine in my local host. My hosting is in linux is it a problem? Because once I have moved it said the file names not found for my libraries since the file names had Capital first letter but in loading I gave all in small letter. It worked in my localhost but when I moved to the hosting it said can't find the files So I changed all to small name. Now I am getting the above problem. Please see the url for error message, and please help me urgently.

http://www.e02tamils.com/test/index.php/user/register

Thank you in advance.