Latest Drupal 8 install fails

Hello, I have tried to install Drupal 8 but can’t install it as all the V8 builds fail to install with the following error: Additional uncaught exception thrown while handling exception. Original SymfonyComponentRoutingExceptionRouteNotFoundException: Route “<none>” does not exist. in DrupalCoreRoutingRouteProvider->getRouteByName() (line 187 of D:TestcorelibDrupalCoreRoutingRouteProvider.php). DrupalCoreRoutingRouteProvider->getRouteByName(”)[…]