FatalErrorException in AccountController.php: Class 'App\Facades\QueryCache' not found

AccountController.php

<?php namespace App\Http\Controllers;

use App\Facades\QueryCache;
use App\Http\Requests;
use App\Http\Controllers\Controller;

use App\Models\Account;

use DebugBar\DebugBar;
use Illuminate\Database\Eloquent\Builder as EloquentQuery;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Session;
use Illuminate\Support\Facades\Cache;

class AccountController extends Controller {
	/**
	 * Display the specified resource.
	 *
	 * @param  int  $id
	 * @return Response
	 */
	public function show($id)
	{
        $test = QueryCache::cacheKeyFromQuery(Account::where('AccountNumber', '=', $id));
        dd($test);
	}
}

app.php

<?php

return [
	'providers' => [
	    // Stuff...
        'App\Providers\HelpersServiceProvider',
	],

	'aliases' => [
	    // Stuff...
        'QueryCache' => 'App\Facades\QueryCache',
	],
];

HelpersServiceProvider.php

<?php namespace App\Providers;

use App\Helpers\QueryCacheHelper;
use Illuminate\Support\ServiceProvider;

class HelpersServiceProvider extends ServiceProvider {

	/**
	 * Bootstrap the application services.
	 *
	 * @return void
	 */
	public function boot()
	{
		//
	}

	/**
	 * Register the application services.
	 *
	 * @return void
	 */
	public function register()
	{
        $this->app->bind('queryCache', function () {
            return new QueryCacheHelper;
        });
	}
}

QueryCacheFacade.php

<?php namespace App\Facades;

use Illuminate\Support\Facades\Facade;

class QueryCache extends Facade {
    protected static function getFacadeAccessor() { return 'queryCache'; }
}

QueryCacheHelper.php

<?php namespace App\Helpers;

use Closure;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Cache;
use Illuminate\Database\Eloquent\Builder as EloquentQuery;


class QueryCacheHelper {
	// Implementation
}