User Level Access System

Hi,

I am following this tutorial:

http://www.yiiframework.com/wiki/191/implementing-a-user-level-access-system/

But I keep getting the error:

include(User.php) [<a href=‘function.include’>function.include</a>]: failed to open stream: No such file or directory

Can anyone please help me?

what is the name of the class and the file make sure the are exactly same case sensitive