Vmware powercli设置networkadapter对象引用未设置为对象的实例

我从中复制了这个示例（示例5），并对其进行了轻微修改以供自己使用，但它抛出了一个错误：

Get-VM SDBNAPPQA03 | Get-NetworkAdapter | Set-NetworkAdapter -NetworkName "10.30.88.0/21(VL712)" -Confirm:$false

Set-NetworkAdapter : 7/2/2013 8:07:05 AM    Set-NetworkAdapter        Object reference not set to an instance of an object.
At line:1 char:43
+ Get-VM SDBNAPPQA03 | Get-NetworkAdapter | Set-NetworkAdapter -NetworkName "10.30 ...
+                                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : NotSpecified: (:) [Set-NetworkAdapter], VimException
+ FullyQualifiedErrorId : Core_BaseCmdlet_UnknownError,VMware.VimAutomation.ViCore.Cmdlets.Commands.VirtualDevice.SetNetworkAdapter

我正在从Get-NetworkAdapter获取适配器对象：

Get-VM SDBNAPPQA03 | Get-NetworkAdapter  | Get-Member


   TypeName: VMware.VimAutomation.ViCore.Impl.V1.VirtualDevice.NetworkAdapterImpl

Name             MemberType Definition
----             ---------- ----------
ConvertToVersion Method     T VersionedObjectInterop.ConvertToVersion[T]()
Equals           Method     bool Equals(System.Object obj)
GetHashCode      Method     int GetHashCode()
GetType          Method     type GetType()
IsConvertableTo  Method     bool VersionedObjectInterop.IsConvertableTo(type type)
LockUpdates      Method     void ExtensionData.LockUpdates()
ToString         Method     string ToString()
UnlockUpdates    Method     void ExtensionData.UnlockUpdates()
Client           Property   VMware.VimAutomation.ViCore.Interop.V1.VIAutomation Client {get;}
ConnectionState  Property    VMware.VimAutomation.ViCore.Types.V1.VirtualDevice.ConnectInfo ConnectionState {get;}
ExtensionData    Property   System.Object ExtensionData {get;}
Id               Property   string Id {get;}
MacAddress       Property   string MacAddress {get;}
Name             Property   string Name {get;}
NetworkName      Property   string NetworkName {get;}
Parent           Property   VMware.VimAutomation.Sdk.Types.V1.VIObject Parent {get;}
ParentId         Property   string ParentId {get;}
Type             Property   VMware.VimAutomation.ViCore.Types.V1.VirtualDevice.VirtualNetworkAdapterType Type {get;}
Uid              Property   string Uid {get;}
WakeOnLanEnabled Property   bool WakeOnLanEnabled {get;}

我可以在vCenter控制台中设置网络名称，没有任何问题

我还尝试了以下命令，结果相同：

(Get-VM SDBNAPPQA03).Guest.Nics.Device | Set-NetworkAdapter -NetworkName "10.30.88.0/21(VL712)" -Confirm:$False

我已从该虚拟机的vCenter下拉列表中确认网络名称正确。我还尝试了列表中的其他选择

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关于如何设置NetworkAdapter有什么想法吗？

结果表明，问题与-NetworkName变量不完全匹配。它必须是准确的，包括案例。 e、 g:我给它输入了“10.30.80.0/21（VL712）”，但左括号前应该有一个空格，以匹配实际的网络名称