Can't install the package

Hello! I am trying to install this package but I get this error.
Using version ^1.2 for akaunting/firewall
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi

   Symfony\Component\Debug\Exception\FatalThrowableError  : Argument 2 passed to Illuminate\Routing\Router::middlewareGroup() must be of the type array, null given, called in C:\OSPanel\domains\crm\vendor\akaunting\firewall\src\Provider.php on line 60

  at C:\OSPanel\domains\crm\vendor\laravel\framework\src\Illuminate\Routing\Router.php:880
    876|      * @param  string  $name
    877|      * @param  array  $middleware
    878|      * @return $this
    879|      */
  > 880|     public function middlewareGroup($name, array $middleware)
    881|     {
    882|         $this->middlewareGroups[$name] = $middleware;
    883|
    884|         return $this;

  Exception trace:

  1   Illuminate\Routing\Router::middlewareGroup("firewall.all")
      C:\OSPanel\domains\crm\vendor\akaunting\firewall\src\Provider.php:60

  2   Akaunting\Firewall\Provider::registerMiddleware(Object(Illuminate\Routing\Router))
      C:\OSPanel\domains\crm\vendor\akaunting\firewall\src\Provider.php:33

  Please use the argument -v to see more details.
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1

Installation failed, reverting ./composer.json to its original content.
akaunting / laravel-firewall

Can't install the package #6
