SharePoint 2010: "Failed to create sample data" when running Wizard after installing language pack

I’m installing a spanish lang pack on SP 2010 and Wizard that runs after installation gives a “failed to create sample data” error, plus this stack:

02/11/2011 11:31:59  14  ERR                      Exception: System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.SharePoint.SPEvaluatorModeProvisioner.IsProvisioned()
   at Microsoft.Office.Server.EvaluatorModeProvisioning.SharedEvaluatorModeProvisioner.IsProvisioned()
   at Microsoft.SharePoint.SPEvaluatorModeProvisioner.Provision()
   at Microsoft.Office.Server.EvaluatorModeProvisioning.SharedEvaluatorModeProvisioner.Provision()
   at Microsoft.SharePoint.PostSetupConfiguration.EvalModeProvisionTask.EvalProvision()
   at Microsoft.SharePoint.PostSetupConfiguration.EvalModeProvisionTask.Run()
   at Microsoft.SharePoint.PostSetupConfiguration.TaskThread.ExecuteTask()

Searched for this issue, tried couple recip开发者_如何学Ces but no luck. Ideas truly appreciated, thanks!

Workaround is to create a root site collection on port 80. That way, Wizard finishes successfully.