Yii Framework Compatibility?

Are there any compatibility issues of the Yii Framework with different versions of PHP or different versions of Apache running?

I’m trying to setup a copy of a website that is running on the web, in my locahost. When I try the login button, I get the following Fatal error: Class ‘User’ not found in home/quiktester/git_portal/webroot/protected/components/UserIdentity.php on line 18.

The very same copy seems to be working fine in a colleague’s machine (localhost). And also on the website. Unable to fix the issue.

Anybody’s got any thoughts on resolving this? Or anyone’s faced similar issues? Thanks.

(Localhost root set to home/quiktester/)

It might be that unix systems are case sensitive while windows isn’t

Also, be sure that the "User" class in beeing imported