Laravel5 Intervention Image NotReadableException

I'm trying to upload images with gd driver, for profiles or posts, on my laravel project on live server but always have this error:

NotReadableException Unable to read image from file (). in Decoder.php (line 20)

My upload works in local but not on this live server, I don't know why and I already tried changing the function, using imagick driver (the installation was successful but the upload is so slow that I get timed out), and editing the php.ini (5.6). Here is my upload post image code:

$image = $request->file('image');

if($image)
        {
        Image::configure(array('driver' => 'gd'));

        $filename  = $user->role . '-' . $user->id . '-' . time() . '.jpg';

        $path = public_path('uploads/posts/' . $filename);

        $filepath = 'uploads/posts/' . $filename;

        Image::make($image)->resize(800, 600, function ($constraint) {
            $constraint->aspectRatio();
        })->save($path);

        $post->image = $filepath;
    }

via Chebli Mohamed