SharePoint 2013 Configuration Wizzard

I have fixed several erros but this one has left me really scratching my head.
Is happing at end of step 8 or begining of step 9.
Failed to install application content files.

12/29/2012 09:42:02  11  INF                  Leaving function TaskBase.OnTaskNotify
12/29/2012 09:42:18  11  ERR                  Task applicationcontent has failed with an unknown exception
12/29/2012 09:42:18  11  ERR                  Exception: System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.SharePoint.Administration.SPAspConfigurationFile.ApplyActionToXmlDocument(XmlDocument xdAction, XmlDocument xd, String sourceFileName, SupportedXmlDocutmentActions supportedActions)
   at Microsoft.SharePoint.Administration.SPAspConfigurationFile.MergeWebConfig(XmlDocument xdWebConfig, String fileMask)
   at Microsoft.SharePoint.Administration.SPWebService.ApplyApplicationContentToLocalServer()
   at Microsoft.SharePoint.PostSetupConfiguration.ApplicationContentTask.Run()
   at Microsoft.SharePoint.PostSetupConfiguration.TaskThread.ExecuteTask()
12/29/2012 09:42:18  11  INF                  Entering function Common.BuildExceptionMessage
Error.jpg
PSCDiagnostics-12-29-2012-9-36-0.log