Laravelで存在しないコントローラへのルーティングを書いたらInvalid route action エラーになった

$ php artisan make:controller NewSingleActionController --invokable

   UnexpectedValueException  : Invalid route action: [App\Http\Controllers\NewSingleActionController].

  at /var/www/laravel_app/vendor/laravel/framework/src/Illuminate/Routing/RouteAction.php:92
    88|      */
    89|     protected static function makeInvokable($action)
    90|     {
    91|         if (! method_exists($action, '__invoke')) {
  > 92|             throw new UnexpectedValueException("Invalid route action: [{$action}].");
    93|         }
    94|
    95|         return $action.'@__invoke';
    96|     }

  Exception trace:

  1   Illuminate\Routing\RouteAction::makeInvokable("App\Http\Controllers\NewSingleActionController")
      /var/www/laravel_app/vendor/laravel/framework/src/Illuminate/Routing/RouteAction.php:47

  2   Illuminate\Routing\RouteAction::parse("new_route", ["App\Http\Controllers\NewSingleActionController", "App\Http\Controllers\NewSingleActionController"])
      /var/www/laravel_app/vendor/laravel/framework/src/Illuminate/Routing/Route.php:162

  Please use the argument -v to see more details.