Unhandled Exception: System.InvalidOperationException: Handle is not initialized.
   at System.Runtime.InteropServices.GCHandle.FromIntPtr(IntPtr value)
   at Python.Runtime.ManagedType.GetManagedObject(IntPtr ob)
   at Python.Runtime.Converter.ToManagedValue(IntPtr value, Type obType, Object& result, Boolean setError)
   at Python.Runtime.Converter.ToManaged(IntPtr value, Type type, Object& result, Boolean setError)
   at Python.Runtime.MethodBinder.Bind(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info, MethodInfo[] methodinfo)
   at Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info, MethodInfo[] methodinfo)
   at Python.Runtime.MethodObject.Invoke(IntPtr target, IntPtr args, IntPtr kw, MethodBase info)
   at Python.Runtime.MethodObject.Invoke(IntPtr inst, IntPtr args, IntPtr kw)
   at Python.Runtime.ModuleFunctionObject.tp_call(IntPtr ob, IntPtr args, IntPtr kw)