Strange problem with header information.

[eluser]cheshirecat[/eluser]
I see there is no echo. I've just found even more interesting thing. In my application a use the newest version of Erkanaauth library (the one with MY_Controller library). So, when I get to login page and log in, I can now get to the controller in which error happened. And when i log out, the error happens again.
But the admin controller should redirect to the login controller by itself if you are not logged in. Instead of this it shows error I described later.