[Tanya error] An Error Was Encountered Unable to load the requested file

Class Login extends Controller {
 
	function login()
	{
		parent::Controller();
		$this->load->model('Login_model','',TRUE);
	}
 
	function index()
	{
		if ($this->session->userdata('login') == TRUE)
		{
			redirect ('absen');
		}
		else
		{
			$this->load->view('login/login_view');
		}
	}
 
	function process_login()
	{
		$this->form_validation->set_rules('username','Username','required');
		$this->form_validation->set_rules('password','Password','required');
 
		if ($this->form_validation->run() == TRUE)
		{
			$username=$this->input->post('username');
			$password=$this->input->post('password');
 
			if ($this->Login_model->check_user($username,$password)==TRUE)
			{
				$data = array('username' =>$username, 'login' =>TRUE);
				$this->session->set_userdata($data);
				redirect('absen');
			}
			else
			{
			$this->session->set_flashdata('message','Maaf, username atau password anda salah');
			redirect ('login/index');
			}
		}
		else
		{
			$this->load->view('login/login_view');
		}
	}
 
	function process_logout()
	{
		$this->session->sess_destroy();
		redirect('login','refresh');
	}
 
}
 
 
 
Kira2 ada yg bisa kasih solusinya?
terimakasih