I have replaced this code:
$para array(
'id'=>$id, 'name'=>$name
);
$this->session->set_flashdata('para',$para);
redirect('login_controller/get_permissions);
to
$CI = get_instance();
$CI->load->library('session');
$para array(
'id'=>$id, 'name'=>$name
);
$CI->session->set_flashdata('para',$para);
redirect('login_controller/get_permissions);
Its working now...