Not understanding form validation

[eluser]JuanitoDelCielo[/eluser]
You should send it to to same controller and method over an over in order to get the errors

Code:

class User extends CI_Controller {

    public function insert() {

        $this->form_validation->set_rules('email', 'E-mail', 'required|trim');

        if ( $this->form_validation->run() ) {

            //Insert into the database
            //Succesful message

        } else {

            $this->load->view('newuserform');

        }

    }

}

View

Code:

<?php echo form_open('user/insert'); ?>
    <?php echo form_label('E-mail', 'email'); ?>
    <?php
        $input = array(
        'name'  => 'email',
        'class' => 'txt',
        'value' => set_value('email')
    );
        echo form_input($input);
    ?>
    <?php echo form_submit('', 'Create User',); ?>
<?php echo form_close(); ?>