Cannot send email using Codeigniter on Wamp server

I want to send email in Codeigniter and using wamp server using the below configurations but i'm getting following error:

Severity: Warning Message: mail(): Failed to connect to mailserver at "ssl://smtp.gmail.com" port 465, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set(). Unable to send email using PHP mail(). Your server might not be configured to send mail using this method.

$config = Array(
        'protocol' => 'smtp',
        'smtp_host' => 'ssl://smtp.gmail.com',
        'smtp_port' => 465,
        'smtp_user' => 'XXXX@gmail.com', 
        'smtp_pass' => 'XXXXXX', 
        'mailtype' => 'html',
        'charset' => 'utf-8',
        'newline' => '\r\n',
        'wordwrap' => TRUE
      );

            $message = 'sample';
            $this->load->library('email', $config);
            $this->email->set_newline("\r\n");
            $this->email->from('xyz@gmail.com');
            $this->email->to('abc@gmail.com');
            $this->email->subject('Your Subject');
            $this->email->message($message);
            if($this->email->send())
           {
            echo 'Email sent.';
           }
           else
          {
           show_error($this->email->print_debugger());
          }