Call to a member function embed() on null

Hi. Trying to embed an image to the email, but getting the above error.

Here is my controller

public function update($id)
    {
        $data = Input::all();
        $user = User::find($id);

          $file = array('img' => Input::file('img'));
          $rules = array(
            'img' => 'required',
            'performer_name', 
            ); 

          $validator = Validator::make(Input::all(), $rules);
          if ($validator->fails()) {
            return Redirect::back()->withErrors($validator)->withInput();
          }
          else {
            if (Input::file('img')->isValid()) {
              $destinationPath = 'img/uploads/artist'; 
              $extension = Input::file('img')->getClientOriginalExtension(); 
              $fileName = rand(11111,99999).'.'.$extension; 
              Input::file('img')->move($destinationPath, $fileName); 
              $user->img = '/'.$destinationPath.'/'.$fileName;
              $pathToFile = public_path().$user->img;

              Session::flash('success', 'Upload successfully'); 

              Mail::send('emails.fb16', $data, function($message) use ($data, $pathToFile)
                {
                $message->from($data['leader_email'] , $data['leader_name']);
                $message->to('xxx', 'xxx')->cc('xxx')->subject('xxx');
                $message->attach($pathToFile);
                });
            }
            else {
              Session::flash('error', 'uploaded file is not valid');
            }
          }

        $user->fill($data); 
        $user->save();
        return Redirect::route('fb16id', array(Auth::user()->id));

    }

Here is my view

<?php
$pathToFile = Input::get('pathToFile');
$performer_name = Input::get('performer_name');
$profile = Input::get ('profile');
$leader_name = Input::get ('leader_name');
$leader_email = Input::get ('leader_email');
$message = Input::get ('message');
$date_time = date("F j, Y, g:i a");
?> 

<p>
<img src="<?php echo $message->embed($pathToFile); ?>">
<?php echo ($performer_name); ?><br>
<?php echo ($profile); ?><br>
<?php echo ($leader_name); ?><br>
<?php echo ($leader_email); ?><br>
<?php echo ($message); ?><br>
Date: <?php echo($date_time); ?><br>
</p>

Thanks for any help.