Controller with few errors

[eluser]Udi[/eluser]
Hi.

I have some controller named User,

When I'm running the login() method (wwww.example.com/user/login/)
I get these strange errors:

Call to a member function isLogged() on a non-object in .... user.php on line 96

Code:

if($this->major->isLogged())

when I comment out this line I get more and more [one after another] errors like this but of other models and libraries..

I upgraded to 1.7, but this problem started even before the upgrade.

P.S
I posted it in the wrong forum, sorry :|