php - CodeIgniter Cannot modify header information

Hi Currently Im still Learning CodeIgniter. Im trying to use its session and enabled the session in autoload file

First the file structure of files is like this/

I structure my files like this. all templates will go in views/index.php

my problem is I get this error Cannot modify header information

I have a controller Home

    class Home extends CI_Controller{  

        public function index()
        {     
            $view['title'] = 'Welcome';


            $data['data'] = $view;
            $data['content'] = 'home';
            $this->load->view('index',$data);
        }

    } 

My views is something like this

views/index.php

 
 
            //echo ("Welcome User: " . $datas["user_id"]); 
        $this->load->view('header',$data);
        $this->load->view('template/' . $content);
        $this->load->view('footer',$data);
    ?>

 

views/header.php

views/footer.php

then my content

views/template/home.php

 
    

           
Welcome
    

 

I don't know why do i get that error session. Please hope you could help me.
I didn't even set a session. I have just added it in auto load and don't know why i get that header problem. Is my file structure wrong?

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by
(output started at site/application/controllers/home.php:2)

Filename: libraries/Session.php

Line Number: 675

Answer

You probably have a space before the opening tag in your Home controller which is causing output.

// a space here is enough to cause output