and here is the log
The WSUS administration console has encountered an unexpected error. This may be a transient
error; try restarting the administration console. If this error persists,
Try removing the persisted preferences for the console by deleting the wsus file under %appdata%\Microsoft\MMC\.
System.AppDomainUnloadedException -- Attempted to access an unloaded AppDomain.
Source
MMCFxCommon
Stack Trace:
at Microsoft.ManagementConsole.Internal.ISnapInPlatform.ProcessCommand(Command
command)
at Microsoft.ManagementConsole.NodeSyncManager.OnNodeChanged(Object sender, NodeChangedEventArgs
e)
at Microsoft.ManagementConsole.Node.NodeChangedEventHandler.Invoke(Object sender,
NodeChangedEventArgs e)
at Microsoft.UpdateServices.UI.SnapIn.Scope.BaseScopeNode.ClearActionsPaneActions()
at Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.ShowUnhandledErrorMessage(ErrorOccurredEventArgs
e)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at Microsoft.UpdateServices.UI.AdminApiAccess.ErrorManager.ReportUnhandledError(Exception
ex, Object errorContext)
at Microsoft.UpdateServices.UI.SnapIn.Pages.ComputersListPage.GetListScope()
at Microsoft.UpdateServices.UI.SnapIn.Pages.BaseListPage.RefreshScope()
at Microsoft.UpdateServices.UI.SnapIn.Pages.BaseListPage.Initialize(FormView
thisScope)