Upgrade Sophos Console from 5.0 to 5.1 error

Hi,

When i upgrade from 5.0 to 5.1, i encounter the following error message:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ServiceModel.EndpointNotFoundException: There was no endpoint listening at intranet-server/.../EncryptionFrontEnd that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details. ---> System.Net.WebException: The remote server returned an error: (404) Not Found.
   at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   --- End of inner exception stack trace ---

Server stack trace:
   at System.ServiceModel.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeEndService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at Sophos.Encryption.FrontEnd.Interfaces.IEncryptionFEServiceAsync.EndIsEncryptionInstalled(IAsyncResult result)
   at Sophos.Encryption.UI.Module.<>c__DisplayClass4.<.ctor>b__2(IEncryptionFEServiceAsync s)
   at Sophos.Encryption.FrontEnd.Interfaces.ClientChannelWrapper`1.EndInvoke[TResult](Func`2 function)
   at Sophos.Encryption.UI.Module..ctor(IExtensionManager extensionManager, IFrontEndProxyFactory factory)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle._InvokeConstructor(Object[] args, SignatureStruct& signature, IntPtr declaringType)
   at System.RuntimeMethodHandle.InvokeConstructor(Object[] args, SignatureStruct signature, RuntimeTypeHandle declaringType)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at Sophos.UIController.UIControl.<Initialize>b__a()
   at Sophos.UIController.Product.Logging.LogMethod(MemberInfo method, Action func)
   at Sophos.UIController.UIControl.Initialize()

----- [outer exception] -----
   -- error: 0x80131604
   -- facility: C#/.NET

   at 6
   at 5
   at 4
   at 3
   at 2
   at 1
   at class ATL::CComPtr<struct UIController::IUIControl> __cdecl createUIController(struct IDispatch *,const wchar_t *)
   at __w64 long __thiscall CMainFrame::OnCreate(struct tagCREATESTRUCTW *)
   at int __cdecl Run(int,class bl::CommandLine,enum bl::ConsoleType::Type)
   at int __stdcall wWinMain(struct HINSTANCE__ *,struct HINSTANCE__ *,wchar_t *,int)

I checked in the knowlegde base

http://www.sophos.com/en-us/support/knowledgebase/117719.aspx - useless, found the file but cannot found what it say in the knowledgebase

Can anyone please help?

Thank you.