Hi, this Code: --------------------------------------------------------- def stateChanged(): print "sdf" bb.WiimoteChanged += System.EventHandler(stateChanged); --------------------------------------------------------- ist working in a cygwin xterm. (no python installed in cygwin) But ist gives me this error in a Windows shell: Unhandled Exception: System.TypeInitializationException: The type initializer fo r 'Python.Runtime.CodeGenerator' threw an exception. ---> System.InvalidCastExce ption: Unable to cast object of type 'System.Reflection.Module' to type 'System. Reflection.Emit.ModuleBuilder'. at System.Reflection.Emit.AssemblyBuilderData.GetInMemoryAssemblyModule() at System.AppDomain.InternalDefineDynamicAssembly(AssemblyName name, Assembly BuilderAccess access, String dir, Evidence evidence, PermissionSet requiredPermi ssions, PermissionSet optionalPermissions, PermissionSet refusedPermissions, Sta ckCrawlMark& stackMark, IEnumerable`1 unsafeAssemblyAttributes) at System.AppDomain.DefineDynamicAssembly(AssemblyName name, AssemblyBuilderA ccess access) at Python.Runtime.CodeGenerator..cctor() --- End of inner exception stack trace --- at Python.Runtime.DelegateManager.GetDispatcher(Type dtype) at Python.Runtime.DelegateManager.GetDelegate(Type dtype, IntPtr callable) at Python.Runtime.DelegateObject.tp_new(IntPtr tp, IntPtr args, IntPtr kw) at e__NativeCall.Call_3(IntPtr , IntPtr , IntPtr , IntPtr ) at Python.Runtime.MetaType.tp_call(IntPtr tp, IntPtr args, IntPtr kw) at Python.Runtime.Runtime.Py_Main(Int32 argc, String[] argv) at Python.Runtime.PythonConsole.Main(String[] args) Any hints? Regards, Sandro