Starting with Community Auth

Hi,

I've installed Community Auth to use on a new project (CodeIgniter Version 3.1.6).

I've followed the readme instructions, however I must have done something wrong as I get the errors, when displaying the page /Examples :

Code:

Message: Use of undefined constant LOGIN_PAGE - assumed 'LOGIN_PAGE' (this will throw an Error in a future version of PHP)
...
Message: Use of undefined constant AUTH_REDIRECT_PARAM - assumed 'AUTH_REDIRECT_PARAM' (this will throw an Error in a future version of PHP)

I don't know what to do to "Enable hooks" as specified at the beginning of step 12. I did modify the application/config/hooks.php file as described at step 9.

Any help would be welcomed.

Cheers,
L@u