CI_Controller not found

rajcse

I have installed fuel CMS in my localhost and it's working properly after changing default_controller and 404_override. But when i'm uploading this in live server then it's giving an error like PHP Fatal error: Class 'CI_Controller' not found in /var/www/mysite/system/core/CodeIgniter.php on line 234
Please give me solution ASAP.

almostcompletely

Access rights for the web server's user account.

rajcse

How i will give that?