Что за ошибка в Laravel 5?

[RuntimeException]                                                           
  Error Output: PHP Catchable fatal error:  Argument 2 passed to Illuminate\R  
  outing\UrlGenerator::__construct() must be an instance of Illuminate\Http\R  
  equest, null given, called in /var/www/html/sochi/vendor/laravel/framework/  
  src/Illuminate/Routing/RoutingServiceProvider.php on line 56 and defined in  
   /var/www/html/sochi/vendor/laravel/framework/src/Illuminate/Routing/UrlGen  
  erator.php on line 95