CI On Subdomain Configuration?

Is the configuration for installing CI on a subdomain any different?
Everything works fine when developing on my localhost, but when I move on to my server it can't find my models.
My thought was maybe something to do with the subdomain.  I set up the Base URL as the subdomain, but still no luck.
Is there something special to do here?

I think The configuration is the same.
How do you know that the problem come from of yours models ?

May be you forget to set up your file database.php located in folder config.