get_instance problem

[eluser]JCianflone[/eluser]
Hi everyone,
I'm trying to create a new Exceptions class for a little project I'm working on but I seem to have an issue with getting the CodeIgniter instance. The error I get is:

Fatal error: Call to undefined function get_instance() in ...

My code is this:

Code:

class HUB_Exceptions extends CI_Exceptions {
    
    private $CI;
    
    public function __construct() {
        parent::CI_Exceptions();
        
        $this->CI =& get_instance(); //It breaks on this line here...

    }
}

This is my first time extending a core class, so I'm not 100% sure what's breaking here.

Any help would be greatly appreciated.

Thanks!