Calling a Controller from a hook in CI 3

[eluser]Patroklo[/eluser]
Hi! I am having some issues about loading a controller with a hook. All the autoloaded classes seem to fail with messages like: "Unable to locate the specified class: Session.php". In codeigniter 2.X i didn't have this issue (and I think that in that version all the files where loaded twice, once each time a controller was made). Is there a way to make those calls in codeigniter 3?