Laravel Call to undefined method Intervention\Image\File::delete() - php

Question

I made a method which allows the user to update their profile picture. I also added a function which deletes their old profile picture if they update to a new one. But i get an error saying Call to undefined method Intervention\Image\File::delete().
What is causing this? In the code below it makes perfect sense for me. I hope you guys can help. Thanks in advance
Code:
UserController.php
public function update_avatar(Request $request) {
$this->middleware('auth');
if ($request->hasFile('avatar')) {
$avatar = $request->file('avatar');
$filename = Auth::user()->username . time() . '.' . $avatar->getClientOriginalExtension();
Image::make($avatar)->fit(300,300)->save( public_path('/uploads/avatars/' . $filename));
$user = Auth::user();
$user->avatar = $filename;
$user->save();
//Verwijderd vorige foto
if ($user->avatar != 'default.jpg') {
$path = 'uploads/avatars/';
$lastpath = Auth::user()->Avatarpath;
File::delete(public_path($path . $lastpath));
}
}
return view('user.profile', array('user' => Auth::user()));
Route: Route::post('{username}/profile', 'UserController#update_avatar');
The form that is supposed to do this.
<div class="row">
<div class="col l12 m12 s12">
<div class="card">
<div class="card-content">
<form enctype="multipart/form-data" action="profile" method="POST">
<input type="file" name="avatar">
<input type="hidden" name="_token" value="{{ csrf_token() }}">
<input type="submit" class="pull-right btn btn-primary" value="Change profile">
</form>
</div>
</div>
</div>
</div>
Changing the picture works just fine. If I reload the page the profile picture is updated but it doesn't delete the old one.

Answer 1

try this. does this help.
public function update_avatar(Request $request) {
$this->middleware('auth');
if ($request->hasFile('avatar')) {
$avatar = $request->file('avatar');
$filename = Auth::user()->username . time() . '.' . $avatar->getClientOriginalExtension();
Image::make($avatar)->fit(300,300)->save( public_path('/uploads/avatars/' . $filename));
$user = Auth::user();
$user->avatar = $filename;
$user->save();
//Verwijderd vorige foto
if ($user->avatar != 'default.jpg') {
$path = public_path('uploads'.DIRECTORY_SEPARATOR.'avatars'. DIRECTORY_SEPARATOR.Auth::user()->Avatarpath);
if (file_exists($path)) {
unlink($path);
}
}
}
return view('user.profile', array('user' => $user));
}