Error with email class in CI 3.1.8

$this->email is a string not an object.

Have you something like $this->email = "string" in the controller? or an attribute $email = "string" ?

i am following this https://www.codeigniter.com/user_guide/l...ding-email
as i said this works on my another project which is different version of CI (3.1.5) but in 3.1.8 doesnt work.

this is my project in CI 3.1.5 which the email works perfectly

PHP Code:

$from = $this->config->item('email_info');
$to = $this->session->flashdata('to');
$subject = $this->session->flashdata('subject') . ' | ' . $this->AppName;
$message = $this->session->flashdata('message');

$this->email->from($form['address'], $from['name']);
$this->email->to($to);
        
if($cc) $this->email->cc($cc);

$this->email->subject($subject);
$this->email->message($message);
$this->email->send();