Refferal system error

[Sab]

Hello! I'm looking for someone who can fix this error:

Fatal error: Call to a member function hashed() on a non-object in C:\xampp\htdocs\app\class.users.php on line 259

Line 259:

        $this->addUser($template->form->reg_username, $core->hashed($template->form->reg_password), $template->form->reg_email, $_CONFIG['hotel']['motto'], $_CONFIG['hotel']['credits'], $_CONFIG['hotel']['pixels'], 1, $template->form->reg_figure, $template->form->reg_gender, $core->hashed($template->form->reg_key));

Thank you already.