Use Laravel Debugbar in production for admin

I have a production site (laravel 5.8) which sometime have bug. This bug are not in local. SO i wanted to enable barryvdh debugbar but just for admin in production.

I created DebugMiddleware

<?php

namespace App\Http\Middleware;

use App\User;
use Closure;
use Illuminate\Http\Request;


class DebugMiddleware
{

public function handle($request, Closure $next) // permet d'afficher la debugbar en prod
{

    if (auth()->user() && in_array(auth()->id(), [1])) {
     \DebugBar::enable();
    }
    else {
        Debugbar::disable();
    }

    return $next($request);
}

}

i added this in kernel :

 protected $middlewareGroups = [
......
  \Barryvdh\Debugbar\Middleware\InjectDebugbar::class,
    \App\Http\Middleware\DebugMiddleware::class, /// affiche la debugbar en prod pour l'user 1

And in debugbar.php i have :

 'enabled' => env('DEBUGBAR_ENABLED', null),

The problem is an error

Class DebugBar' not found

when i try to load any page on the site.

via Chebli Mohamed