[IronPython] SystemError: A specified parameter was not correct (vmware api soap call)

[jean-marc pouchoulon]

hello ironpythonlist,

I'm using IronPython 2.0.1 with Vmware API et got an error on a soap call.
the code at http://www.ronnie-midnight-oil.net/2008_06_01_archive.html 
is working  ,  but I want to  use also VimApi.TraversalSpec() object in 
my code  and got an error.

 File "VimService2005", line unknown, in RetrieveProperties
 File "System.Web.Services", line unknown, in Invoke
 File "System.Web.Services", line unknown, in ReadResponse
SystemError: A specified parameter was not correct.

-X:ExceptionDetail

ReadResponse at offset 431678 in file:line:column <filename unknown>:0:0
Invoke at offset 204 in file:line:column <filename unknown>:0:0

RetrieveProperties at offset 65 in file:line:column <filename unknown>:0:0

   à 
Microsoft.Scripting.Actions.Calls.MethodCandidate.Caller.CallWithInstance(Object[] 
args, Boolean& shouldOptimize)
   à 
IronPython.Runtime.Types.BuiltinFunction.BuiltinMethodCaller`3.Call2(CallSite 
site, CodeContext context, TFuncType func, T0 arg0, T1
rg1)
   à 
Microsoft.Scripting.UpdateDelegates.UpdateAndExecute4[T0,T1,T2,T3,TRet](CallSite 
site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
   à __main__(Closure )
   à IronPython.Compiler.RuntimeScriptCode.InvokeTarget(LambdaExpression 
code, Scope scope)
   à IronPython.Compiler.RuntimeScriptCode.Run(Scope scope)
   à IronPython.Hosting.PythonCommandLine.RunFileWorker(String fileName)
   à IronPython.Hosting.PythonCommandLine.RunFile(String fileName)
SystemError: A specified parameter was not correct.

thanks for yours  suggestions

jean-marc