Call to undefined method Illuminate\Validation\Validator::ma

Controller:

<?php namespace App\Http\Controllers;

use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Validation\Factory;
use Illuminate\Validation\Validator;

use Illuminate\Http\Request;

class UsersController extends Controller {

    /**
     * Display a listing of the resource.
     *
     * @return Response
     */
    public function index()
    {
        return view('home');
    }

    /**
     * Display login page.
     *
     * @return Response
     */
    public function login()
    {
        return view('auth.login');
    }

    /**
     * Show the form for registering new member.
     *
     * @return Response
     */
    public function getCreate()
    {
        return view('auth.register');
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return Response
     */
    public function postCreate()
    {
        //$input = Request::all();
        $validator = Validator::make($request::all(),
            array(
                    'email'             => 'required|max:150|email|unique:users',
                    'username'          => 'required|max:60|min:3|unique:users',
                    'password'          => 'required|min:6',
                    'password_again'    => 'required|same:password'
                 )
        );

        /*
      $validator = Validator::make($request->all(), [
            'title' => 'required|unique|max:255',
            'body' => 'required',
        ]);
        */


        if($validator->fails()) {
            return 'Something wrong!';

        } else {
            return 'Validation no error.';

        }
    }


    /**
     * Store a newly created resource in storage.
     *
     * @return Response
     */
    public function store()
    {
        //
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return Response
     */
    public function show($id)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return Response
     */
    public function edit($id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  int  $id
     * @return Response
     */
    public function update($id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return Response
     */
    public function destroy($id)
    {
        //
    }

}