laravelで画像のアップロード

前提・実現したいこと

PHPとLaravelで画像のアップロードをしたいのですが、
getClientOriginalName()でエラーが出ます。

発生している問題・エラーメッセージ

FatalErrorException in AuthController.php line 67:
Call to a member function getClientOriginalName() on string

該当のソースコード

まずコントローラーです。

<?php

namespace App\Http\Controllers\Auth;

use App\User;
use Validator;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\ThrottlesLogins;
use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;
use Image;

class AuthController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Registration & Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users, as well as the
    | authentication of existing users. By default, this controller uses
    | a simple trait to add these behaviors. Why don't you explore it?
    |
    */

    use AuthenticatesAndRegistersUsers, ThrottlesLogins;

    /**
     * Where to redirect users after login / registration.
     *
     * @var string
     */
    protected $redirectTo = '/';

    /**
     * Create a new authentication controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest', ['except' => 'logout']);
    }

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => 'required|max:255',
            'email' => 'required|email|max:255|unique:users',
            'password' => 'required|confirmed|min:6',
        ]);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return User
     */
    protected function create(array $data)
    {
        $fileName = $data['avatar']->getClientOriginalName();
        Image::make($data['avatar'])->save(public_path() . '/images/' . $fileName);

        return User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
            'avatar' => $fileName,
        ]);
    }
}

フォームです。

@extends('layout')

@section('content')
<div class="bgcolor-white pt1em pb1em" id="contents">
    <div id="main_cnt_wrapper">
        <div id="yjContentsBody">
            <div class="yjContainer">
                <div class="form_box">
                    <h2>m<span>新規登録</span></h2>
                    {!! Form::open(array('files' => true)) !!}
                     @if (count($errors) > 0)
                        <div id="error_explanation">
                            <ul>
                                @foreach ($errors->all() as $error)
                                    <li>{{ $error }}</li>
                                @endforeach
                            </ul>
                        </div>
                    @endif
                    <div class="label">
                        {{ Form::label('email') }}
                        {{ Form::email('email', '', ['placeholder' => 'メールアドレスを入力']) }}
                    </div>
                    <div class="label">
                        {{ Form::label('password') }}
                        {{ Form::password('password', ['placeholder' => 'パスワードを入力']) }}
                    </div>
                    <div class="label">
                        {{ Form::label('password_confirmation') }}
                        {{ Form::password('password_confirmation', ['placeholder' => 'パスワードを入力（確認）']) }}
                    </div>
                    <div class="label">
                        {{ Form::label('name') }}
                        {{ Form::text('name') }}
                    </div>
                    <div class="field">
                        {{ Form::file('avatar') }}
                    </div>

                    <div class="submit">
                        <div class="actions">
                            {{ Form::submit('Create User', ['class' => 'btn btn--block']) }}
                        </div>
                    </div>

                    {!! Form::close() !!}

                    <div class="more_link_box">
                        <strong>すでにアカウントを持っていますか？</strong>
                        <a href="/login">Log in</a>
                    </div>
                </div>
            </div>
        </div>
    </div>
@endsection

補足情報(言語/FW/ツール等のバージョンなど)

windows
php 5.6.8
laravel 5.2
composer 1.4.2