laravel 5.3 dasar bagian database

mohon pencerahannya gan,, lagi belajar & ngikutin video Laravel 5.3 dasar bagian Database dengan Query Builder,, ada eror kayak gini: <a href=' http://imgur.com/1TCNbbH '> http://imgur.com/1TCNbbH </a>

kode BlogController.php:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
//use Illuminate\Support\Facades\DB;
use DB;
use App\Http\Requests;

class BlogController extends Controller
{
    public function index()
    {
    	return view('blog/halo');
    }

    public function show($id)
    {
    	$nilai = 'Ini adalah halaman ' . $id;
    	$users = DB::table('users')->get();

        $unescaped = '<script> alert("x!") </script>';

    	return view('blog/single', ['blog' => $nilai , 'users' => $users, 'unescaped' => $unescaped]);
    }
}

single.blade.php:

@extends('layouts.master')

@section('title', 'Blog Wah')

@section('content')
		<h1>Selamat Datang Di Blog Ieu</h1>
		<h2>  {{ $blog }} !! </h2>

		@foreach($users as $user)
			<li> {{ $user->username }} </li>
		@endforeach

		{{ $unescaped }}

		@if(count($users) > 5)
			<p> usernya lebih dari lima </p>
		@else
			<p> usernya tidak lebih dari lima </p>
		@endif

@endsection