Class 'CI_Controller' not found in \system\core\CodeIgniter.php on line 343

Hi there,

I'm just updating my codeigniter to 3.0 and i get this error message.
I have my database setup and i think i didn't get everything correct, can you please help me ?

CodeIgniter v3 requires the class names to be ucfirst().
for example:
models/ion_auth_model.php => models/Ion_auth_model.php

Have you tried this?