title: Class 'App\Providers\URL' not found when upload to read server
body: <p>I just upgrade from Laravel4.2 to Laravel5.3 and it work as well in Localhost but when upload to server I got this below errors.</p>
  
  <p>Whoops, looks like something went wrong.</p>
  
  <pre><code>1/1
  FatalThrowableError in AppServiceProvider.php line 18:
  Class 'App\Providers\URL' not found
  
  in AppServiceProvider.php line 18
  at AppServiceProvider-&gt;boot()
  at call_user_func_array(array(object(AppServiceProvider), 'boot'), array()) in Container.php line 508
  at Container-&gt;call(array(object(AppServiceProvider), 'boot')) in /var/www/backoffice/vendor/laravel/framework/src/Illuminate/Foundation/Application.php line 769
  at Application-&gt;bootProvider(object(AppServiceProvider)) in /var/www/backoffice/vendor/laravel/framework/src/Illuminate/Foundation/Application.php line 752
  at Application-&gt;Illuminate\Foundation\{closure}(object(AppServiceProvider), '15')
  at array_walk(array(object(EventServiceProvider), object(RoutingServiceProvider), object(AuthServiceProvider), object(CookieServiceProvider), object(DatabaseServiceProvider), object(EncryptionServiceProvider), object(FilesystemServiceProvider), object(FoundationServiceProvider), object(NotificationServiceProvider), object(PaginationServiceProvider), object(SessionServiceProvider), object(ViewServiceProvider), object(HtmlServiceProvider), object(ExcelServiceProvider), object(DatatablesServiceProvider), object(AppServiceProvider), object(AuthServiceProvider), object(EventServiceProvider), object(RouteServiceProvider)), object(Closure)) in Application.php line 753
  at Application-&gt;boot() in BootProviders.php line 17
  at BootProviders-&gt;bootstrap(object(Application)) in Application.php line 203
  at Application-&gt;bootstrapWith(array('Illuminate\Foundation\Bootstrap\DetectEnvironment', 'Illuminate\Foundation\Bootstrap\LoadConfiguration', 'Illuminate\Foundation\Bootstrap\ConfigureLogging', 'Illuminate\Foundation\Bootstrap\HandleExceptions', 'Illuminate\Foundation\Bootstrap\RegisterFacades', 'Illuminate\Foundation\Bootstrap\RegisterProviders', 'Illuminate\Foundation\Bootstrap\BootProviders')) in Kernel.php line 253
  at Kernel-&gt;bootstrap() in Kernel.php line 144
  at Kernel-&gt;sendRequestThroughRouter(object(Request)) in Kernel.php line 116
  at Kernel-&gt;handle(object(Request)) in index.php line 53
  </code></pre>