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// this is the controller miscellaneous.php
function feedbackSave()
    {
        $data=array();
        $data['subject'] = $this->input->post('subject', true);
        $data['name'] = $this->input->post('lname', true);
        $data['address'] = $this->input->post('address', true);
        $data['email'] = $this->input->post('email', true);
        $data['mobile'] = $this->input->post('mobile', true);
        $data['comments'] = $this->input->post('comments', true);
        
        $date_time = date('Y-m-d H:i:s');
        $data['date'] = $date_time;

        $this->load->model($this->config->item('general_model'), 'save_feedback',TRUE);
        $this->save_feedback->feedbackSave($data);
        
        $this->session->set_flashdata('feedback', 'Feedback send successfully');
        redirect('miscellaneous/feedback');

    }


// Fatal error: Call to undefined method CI_Session::set_flashdata() 
// in C:\xampp\htdocs\travelmartbd\application\controllers\miscellaneous.php on line 81

// why?