PHPMailer: Attempt to assign property of non-object - php

Question

I'm frustrated to fix this.
One time I made it work. The next day, an error annoys me:
Warning: Attempt to assign property of non-object in C:\XAMPP\htdocs\HAF\includes\sendmail.php on line 356
Help me fix this :(
Here's my code:
sendmail.php
class SendMail {
function notification($recipient, $name, $subject, $message) {
global $email;
$email->Host = "smtp.gmail.com";
$email->SMTPAuth = true;
$email->Username = "******#gmail.com";
$email->Password = "**********";
$email->SMTPSecure = "tls";
$email->Port = 465;
$email->setFrom('admin#gmail.com', 'My WebApp');
$email->addAddress($recipient);
$email->isHTML(true);
$email->Subject = $subject;
$email->Body = $message;
if(!$email->send()) {
return false;
} else {
return true;
}
}
}
index.php
$email = "jaydenjames#gmail.com";
$name = "Jayden James";
$message = "Welcome {$name}!";
$SendMail->notification($email, $name, 'Welcome guest!', $message);

Answer 1

update answer with gmail configuration....
$mail = new PHPMailer();
$mail->IsSMTP();
$mail->CharSet="UTF-8";
$mail->SMTPSecure = 'tls';
$mail->Host = 'smtp.gmail.com';
$mail->Port = 587;
$mail->Username = 'MyUsername#gmail.com';
$mail->Password = 'valid password';
$mail->SMTPAuth = true;
$mail->From = 'MyUsername#gmail.com';
$mail->FromName = 'Mohammad Masoudian';
$mail->AddAddress('anotherValidGmail#gmail.com');
$mail->AddReplyTo('phoenixd110#gmail.com', 'Information');
$mail->IsHTML(true);
$mail->Subject = "PHPMailer Test Subject via Sendmail, basic";
$mail->AltBody = "To view the message, please use an HTML compatible email viewer!";
$mail->Body = "Hello";
if(!$mail->Send())
{
echo "Mailer Error: " . $mail->ErrorInfo;
}
else
{
echo "Message sent!";
}