Session library Issue

Hi guys,
I am developing a website but no idea why the session is not maintaining.When the user logged in the session is maintained but when I retrieve the data from session in another function it returns null while I check out in the logged in function session is maintaining there.

Here is both functions:


public function login(){
$this->load->model('admin_model');
$data['email'] = $this->input->post('email_a');
$data['password'] = md5($this->input->post('pw'));

$result = $this->admin_model->login($data);
//die(var_dump($result));
if($result==true){
echo "true";
$this->load->library('session');
$dataLogin=$this->session->set_userdata('loginData',$result['admin_id']);

// die(var_dump( $this->session->userdata('loginData')));
}


public function profile(){
$id= $this->session->userdata('loginData');
die(var_dump( $id));
}
Can anyone suggest any solution ?

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