Codeigniter flash session not working I have check that no request is made after setting session (was working in windows but not working in ubuntu)

In order controller

$this->session->set_flashdata('order',array('status'=>1,'message'=>'done'));

redirect(base_url().'thank-you/','refresh');

In thank-you controller-

echo json_encode($this->session->flashdata('order'));

But false is output