Добавление хоста в группу портов с помощью pyvomim

Question

Я пытаюсь добавить хост в группу портов в vshere, используя pyvmomi. связь и все работает очень хорошо. когда я пытаюсь добавить хост в группу портов, я получаю следующую ошибку.

    Traceback (most recent call last):
  File "/home/vkm/PycharmProjects/cdm/cdmapp/cdm/helper/switch.py", line 40, in <module>
    vcenter.AddHostPortgroup(host,inputs['dvs_name'],inputs['dv_port_name'])
  File "/home/vkm/PycharmProjects/cdm/cdmapp/cdm/helper/vcenter.py", line 239, in AddHostPortgroup
    host.configManager.networkSystem.AddPortGroup(portgroup_spec)
  File "/home/vkm/PycharmProjects/cdm/cmdenv/lib/python3.5/site-packages/pyVmomi/VmomiSupport.py", line 580, in <lambda>
    self.f(*(self.args + (obj,) + args), **kwargs)
  File "/home/vkm/PycharmProjects/cdm/cmdenv/lib/python3.5/site-packages/pyVmomi/VmomiSupport.py", line 386, in _InvokeMethod
    return self._stub.InvokeMethod(self, info, args)
  File "/home/vkm/PycharmProjects/cdm/cmdenv/lib/python3.5/site-packages/pyVmomi/SoapAdapter.py", line 1366, in InvokeMethod
    raise obj # pylint: disable-msg=E0702
pyVmomi.VmomiSupport.NotFound: (vim.fault.NotFound) {
   dynamicType = <unset>,
   dynamicProperty = (vmodl.DynamicProperty) [],
   msg = 'The object or item referred to could not be found.',
   faultCause = <unset>,
   faultMessage = (vmodl.LocalizableMessage) []
}

Вот мой код:

def AddHostPortgroup(self,host, vswitchName, portgroupName):
    portgroup_spec = vim.host.PortGroup.Specification()
    portgroup_spec.vswitchName = vswitchName
    portgroup_spec.name = portgroupName
    network_policy = vim.host.NetworkPolicy()
    network_policy.security = vim.host.NetworkPolicy.SecurityPolicy()
    network_policy.security.allowPromiscuous = True
    network_policy.security.macChanges = False
    network_policy.security.forgedTransmits = False
    portgroup_spec.policy = network_policy
    host.configManager.networkSystem.AddPortGroup(portgroup_spec)

Пожалуйста, помогите в этом.