flexi auth - A user authentication library for CodeIgniter

[eluser]haseydesign[/eluser]
@code_has_been_ignited

The error suggests there is a misconfiguration problem somewhere with how you have installed the library.

From looking at the error message, I would first check that you have properly defined the session config settings via the flexi auth config file.
In the demo config file, this can be found on line 285 and should look like:

Code:

$config['sessions']['user_id'] = 'user_id';

If that fails, you've probably already gone through it, but try to re-go through each point of the installation guide @ http://haseydesign.com/flexi-auth/user_g...stallation

Other than that, it's hard to pinpoint the problem.
In such a situation I find it is best to make a fresh clean install of CI and the flexi auth demo, and then reverse engineer the registration page to what you want, when it works, compare what is different through the config, controller and view files to the code that is causing the problem now.