Backpack Permission Problem?

app_Http_Kernel.php

...
    /**
     * The application's route middleware.
     *
     * These middleware may be assigned to groups or used individually.
     *
     * @var array
     */
    protected $routeMiddleware = [
        'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
        'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
        'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
        'can' => \Illuminate\Auth\Middleware\Authorize::class,
        'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
        'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
        'role' => \App\Http\Middleware\RoleMiddleware::class,
    ];

app_Http_Middleware_RoleMiddleware.php

<?php

namespace App\Http\Middleware;

use Closure;
use Auth;

use Illuminate\Support\Facades\Log as Log;

class RoleMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next, $role, $permission)
    {
        Log::debug("Handling a request.");

        if (Auth::guest()) {
            return redirect(url(config('backpack.base.route_prefix').'/login'));
        }

        Log::debug("Role / Permission");
        Log::debug($role);
        Log::debug($permission);

        Log::debug("User");
        Log::debug($request->user());


        if (! $request->user()->hasRole($role)) {
            abort(403);
        }

        if (! $request->user()->can($permission)) {
            abort(403);
        }

        return $next($request);
    }
}

route_web.php

```
<?php

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', 'IndexController@index');
Route::get('/home', '\Backpack\Base\app\Http\Controllers\AdminController@dashboard');

Route::get('/test', 'IndexController@test');

Route::group([
    'middleware' => [
        'admin',
        'role:admin,access_backend',
    ],
    'prefix'     => 'admin',
    'namespace'  => 'Admin',
],
function ()
{
    CRUD::resource('city', 'CityCrudController');
});
```