Having Incomprehensible problems with Nette/Mail/Message Please help

Fatal error: Uncaught Error: Class 'Nette\Mail\Message' not found in C:\xampp\htdocs\((project))\((file)).php:66 Stack trace: #0 {main} thrown in C:\xampp\htdocs\((project))\((file)).php on line 66

use Nette\Mail\Message;

        $mail = new Message;
        $mail->setFrom('<dummy@email.com>')
                ->addTo($makeEmails)
                ->setSubject($sub)
                ->setBody($body);

        $mailer = new Nette\Mail\SmtpMailer([
            'host' => 'smtp.gmail.com',
            'username' => '((my gmail addy))',
            'password' => '((password))',
            'secure' => 'ssl',
            'context' =>  [
                'ssl' => [
                    'capath' => '/path/to/my/trusted/ca/folder', //I left this as is and pretty sure it isn't causing the error
                ],
            ],
        ]);
        $mailer->send($mail);