laravel error Argument 2 passed to Illuminate\Routing\UrlGenerator::__construct() must be an instance of Illuminate\Http\Request, null given, called in C:\xampp\htdocs\blogcf\vendor\laravel\framework\src\Illuminate\Routing\RoutingServiceProv code example

Please make sure that you are not using any url() or asset() or other helpers 
functions inside your configuration files