CI update from 1.7 to 2.0 getting Fatal error: Class 'CI_Controller' not found in CodeIgniter.php on line 210

[eluser]Aken[/eluser]
You won't be able to use get_instance() in your extended Security file, because it is loaded before the controller exists (which is what the function is looking for, and why the error comes from that line of CodeIgniter.php).