Could not find Model

[eluser]biber90[/eluser]
I found the solution to my problem
I included the models like this:

$this->load->model(array('update_model', 'buildings_model'));

But when the update_model gets initialized it can not find the function in the building_model. So i changed the order of them.
Another careless mistake, sorry!
And thanks for your help Great forums.