flexi auth - A user authentication library for CodeIgniter

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Hi everyone,

I am using flexi auth in my application, but I meet below error. I do not know how to fix it. I am new in PHP. Please give me some ideas to fix it. I want to import flexi auth demo to my project.

Fatal error: Call to a member function database() on a non-object in /Applications/XAMPP/xamppfiles/htdocs/benicewebserver/webserver/application/models/flexi_auth_lite_model.php on line 38

Thanks and best regards,
TruongPS