does not have element "configuration/configSections/sectionGroup[@name='SharePoint']" or it is invalid

Created a label, name is FinishForm, text is An exception of type System.IO.InvalidDataException was thrown.  Additional exception information: The web configration file, C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\config\webconfig.dlc.xml, does not have element "configuration/configSections/sectionGroup[@name='SharePoint']" or it is invalid.

01/10/2012 14:15:11 8 INF starting service W3SVC (it may already be started)
01/10/2012 14:15:17 8 INF Leaving function ServiceHelper.Start
01/10/2012 14:15:17 8 INF Leaving function ServiceHelper.TryToControlService
01/10/2012 14:15:17 8 ERR Task applicationcontent has failed with an unknown exception
01/10/2012 14:15:17 8 ERR Exception: System.IO.InvalidDataException: The web configration file, C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\config\webconfig.dlc.xml, does not have element "configuration/configSections/sectionGroup[@name='SharePoint']" or it is invalid.
at Microsoft.SharePoint.Administration.SPAspConfigurationFile.ApplyActionToXmlDocument(XmlDocument xdAction, XmlDocument xd, String sourceFileName)
at Microsoft.SharePoint.Administration.SPAspConfigurationFile.MergeWebConfig(XmlDocument xdWebConfig, String fileMask)
at Microsoft.SharePoint.Administration.SPAspConfigurationFile.MergeWebConfig(XmlDocument xdWebConfig)
at Microsoft.SharePoint.Administration.SPWebService.ApplyApplicationContentToLocalServer()
at Microsoft.SharePoint.PostSetupConfiguration.ApplicationContentTask.Run()
at Microsoft.SharePoint.PostSetupConfiguration.TaskThread.ExecuteTask()

检查IIS应用程序池账户密码是否更改。