Adding Radius Client Crashed NPS MMC on Server 2008 R2 Domain Controller

We have 2 Server 2008 R2 Domain Controllers and we have tried add a Radius Client to both inNPS - But every time we try to add the MMC Crashes with this error:

System.Reflection.TargetInvocationException

Microsoft.ManagementConsole.Internal.SnapInMessagePumpProxy.OnThreadException(Object sender, ThreadExceptionEventArgs e)

   at System.Windows.Forms.Application.ThreadContext.OnThreadException(Exception t)

   at System.Windows.Forms.Control.WndProcException(Exception e)

   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)

   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)

   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)

   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)

   at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)

   at Microsoft.ManagementConsole.Internal.ConsoleDialogHost.ShowDialog(WaitCursor waitCursor, ShowDialogCallback callback)

   at Microsoft.ManagementConsole.Advanced.Console.ShowDialog(Form form)

   at Microsoft.SnapIns.NetworkPolicyServer.Nodes.NetworkAccessDeviceNode.ShowNewForm()

   at Microsoft.ManagementConsole.ScopeNode.DoAction(Int32 actionId, IRequestStatus requestStatus)

   at Microsoft.ManagementConsole.Advanced.NamespaceExtension.ProcessRequest(Request request)

   at Microsoft.ManagementConsole.Internal.SnapInClient.Microsoft.ManagementConsole.Internal.IMessageClient.ProcessRequest(Request request)

   at Microsoft.ManagementConsole.Internal.IMessageClient.ProcessRequest(Request request)

   at Microsoft.ManagementConsole.Executive.RequestStatus.BeginRequest(IMessageClient messageClient, RequestInfo requestInfo)

   at Microsoft.ManagementConsole.Executive.SnapInRequestOperation.ProcessRequest()

   at Microsoft.ManagementConsole.Executive.Operation.OnThreadTransfer(SimpleOperationCallback callback)