在laravel邮件中发送附件

每个人我正在尝试发送带有附件的电子邮件。我所做的是:

   controller code snippet:

     try{
           Mail::send(['name' => 'By System'],array(), function($msg) use ($email,$name,$message,$attachment,$ext,$display) {
                        $msg->from('ricket999@gmail.com', 'Markle Admin');
                        $msg->to($email)->subject('Payment Done')
                            ->setBody('This is to notify you that the employee named '.$name.' has been paid for the monthly payment. Thank You.','text/html')
                            ->attach(public_path().'/'.$attachment, ['as' => $display.'.'.$ext, 'mime' => 'application/pdf']);  });
        }
    catch(Exception $e){
             // if any error mark the mail sent status 0
             $result = DB::table('message')->where('name',$name)->where('email',$email)->update(['sent'=>'0']); 
            }

但它显示了这个错误:

    Type error: Argument 1 passed to Swift_Mime_SimpleMessage::attach() must implement interface Swift_Mime_MimeEntity, string given, called in E:\xampp\htdocs\email-send\app\Http\Controllers\HomeController.php on line 133

我错过了什么。我看到了 this 和 this 但它和我的一样,他们说它有效,但为什么我会出现这个错误。感谢您的任何帮助。非常感谢。