I am  getting the following error while running an application in WSE 3.0.
Does anyone encountered such an error :

An unhandled exception of type
'System.Web.Services.Protocols.SoapHeaderException' occurred in
System.Web.Services.dll

Additional information: System.Web.Services.Protocols.SoapHeaderException:
Server unavailable, please try later ---> System.ApplicationException:
WSE842: The service pipeline could not be created. --->
System.MissingMethodException: Method
'System.Web.Services.Protocols.SoapServerMessage.ServerType' not found.
  at System.RuntimeType.InvokeMember(String name, BindingFlags
bindingFlags, Binder binder, Object target, Object[] providedArgs,
ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
  at
Microsoft.Web.Services3.WseProtocol.CreateProtocolPipeline(SoapServerMessage
message)
  at Microsoft.Web.Services3.WseProtocol.RouteRequest(SoapServerMessage
message)
  at System.Web.Services.Protocols.SoapServerProtocol.Initialize()
  at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type,
HttpContext context, HttpRequest request, HttpResponse response, Boolean&
abortProcessing)
  --- End of inner exception stack trace ---
  --- End of inner exception stack trace ---

The client code is something like :
ServiceWse srv = new ServiceWse();  
           string str = srv.HelloWorld();
           Console.WriteLine(str);

I am not using any policy even.

Thanks in Advance

Ravi Dasari