Codeigniter user form errors not showing - php

Question

On my codeigniter login. If user types in incorrect user name it should display error saying Username or Password Incorrect as flash-data. And if user puts in username that does not exist then would throw error Username Not Match Any Records.
Cannot get the form database check errors to display correct way. I can login OK but just not throwing login flash-data errors correct.
How can I get my form database errors to work correct. The main codeigniter form validation are OK just not throwing my database errors.
public function index() {
$this->load->library('form_validation');
$this->form_validation->set_rules('username', 'Username', 'required|trim');
$this->form_validation->set_rules('password', 'Password', 'required');
if ($this->form_validation->run() == FALSE) {
$this->login();
} else {
if ($this->input->post('username') && $this->input->post('password')) {
// Gets the user information from the database.
$user = $this->user_login_model->get('username', $this->input->post('username'));
if ($user) {
// If User Login Success
if ($this->user_login_model->check_password($this->input->post('password'), $user['password']) == TRUE) {
$this->user->login($user['user_id']);
redirect('admin/dashboard');
} else {
$this->session->set_flashdata('error', 'Username or Password Is Does Not Match Any Records!');
$this->login();
}
}
}
}
}
public function login() {
$this->document->setTitle($this->lang->line('heading_title'));
$data['text_login'] = $this->lang->line('text_login');
$data['text_register'] = $this->lang->line('text_register');
$data['entry_username'] = $this->lang->line('entry_username');
$data['entry_password'] = $this->lang->line('entry_password');
$data['action'] = site_url('admin');
$data['button_login'] = $this->lang->line('button_login');
return $this->load->view('common/login', $data);
}
Get User model
/**
* Retrieve a user
*
* #param string where
* #param int value
* #param string user_identification field
*/
public function get($where, $value = FALSE) {
if (!$value) {
$value = $where;
$where = 'user_id';
}
$user = $this->db->where($where, $value)->get($this->table)->row_array();
return $user;
}

Answer 1

Flashdata will only be shown if the user is redirected to another page.
On the failed login action you only load a view to the user's screen. Try altering
$this->login();
to
redirect('controller/login'); //ofc change the controller name first