session flash and validation errors not work in new route file

laravel 5.8 hi I've added a new route file in routes directory with this name 'admin.php' session flash and errors validation don't work in this route file but in web.php session flash and errors of validation works well

this is map method in RouteServiceProvider

 public function map()
    {
        $this->mapApiRoutes();

        $this->mapWebRoutes();

        $this->mapAdminRoutes();
    }

mapAdminRoutes method

   protected function mapAdminRoutes()
    {
        Route::prefix('admin')->middleware(['auth','admin'])
            ->namespace($this->namespace."\Admin")
            ->group(base_path('routes/admin.php'));
    }

I don't use any middleware in admin.php routes

I Tried these deleting ->middleware(['auth','admin']) in mapApiRoutes method

note:session flash and error validations of routes of admin.php work well in web.php

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