NSX-T Power CIi Adding IPset to NSgroups

I am trying to update a nsgroup to be a list of IP sets using the NSX-T api/powershell.  Here is what I have:

    $nsgroupsvc = Get-NsxtService -Name com.vmware.nsx.ns_groups

    $nsgroups = $nsgroupsvc.list()

    $nsgroup = $nsgroups.results | Where-Object {$_.display_name -eq $groupname}

    $nsgroupspec = $nsgroupsvc.Help.create.ns_group.Create()

    $ipSetId = "000acca4-2c15-447c-9218-dc39d5d7249c"

    $nsgroupmemberspec = $nsgroupsvc.Help.create.ns_group.members.Element.Create()

    $nsgroupmemberspec.target_property = "id"

    $nsgroupmemberspec.op = "EQUALS"

    $nsgroupmemberspec.value = $ipSetId

    $nsgroupmemberspec.target_type = "IPSET"

    $nsgroupspec.members.Add($nsgroupmemberspec)

    $nsgroupsvc.update($nsgroup.id, $nsgroupspec)

but the error I get when updating it is:

"System.Management.Automation.CmdletInvocationException: The scope number '2' exceeds the number of active scopes.

Parameter name: scopeID

Actual value was 2. ---> System.Management.Automation.PSArgumentOutOfRangeException: The scope number '2' exceeds the number of active scopes.

Parameter name: scopeID

Actual value was 2.

   at System.Management.Automation.SessionStateInternal.GetScopeByID(Int32 scopeID)

   at System.Management.Automation.SessionStateInternal.GetScopeByID(String scopeID)

   at System.Management.Automation.SessionStateInternal.GetVariableTableAtScope(String scopeID)

   at Microsoft.PowerShell.Commands.VariableCommandBase.GetMatchingVariables(String name, String lookupScope, Boolean& wasFiltered, Boolean quiet)

   at Microsoft.PowerShell.Commands.GetVariableCommand.ProcessRecord()

   at System.Management.Automation.Cmdlet.DoProcessRecord()

   at System.Management.Automation.CommandProcessor.ProcessRecord()

   --- End of inner exception stack trace ---

   at System.Management.Automation.Runspaces.PipelineBase.Invoke(IEnumerable input)

   at System.Management.Automation.PowerShell.Worker.ConstructPipelineAndDoWork(Runspace rs, Boolean performSyncInvoke)

   at System.Management.Automation.PowerShell.CoreInvokeHelper[TInput,TOutput](PSDataCollection`1 input, PSDataCollection`1 output, PSInvocationSettings settings)

   at System.Management.Automation.PowerShell.CoreInvoke[TInput,TOutput](PSDataCollection`1 input, PSDataCollection`1 output, PSInvocationSettings settings)

   at System.Management.Automation.PowerShell.CoreInvoke[TOutput](IEnumerable input, PSDataCollection`1 output, PSInvocationSettings settings)

   at System.Management.Automation.PowerShell.Invoke[T](IEnumerable input, IList`1 output, PSInvocationSettings settings)

   at System.Management.Automation.PowerShell.InvokeWithDebugger(IEnumerable`1 input, IList`1 output, PSInvocationSettings settings, Boolean invokeMustRun)

   at System.Management.Automation.ScriptDebugger.ProcessCommand(PSCommand command, PSDataCollection`1 output)

   at Microsoft.PowerShell.EditorServices.Session.PowerShell4Operations.ExecuteCommandInDebugger[TResult](PowerShellContext powerShellContext, Runspace currentRunspace, PSCommand psCommand, Boolean sendOutputToHost, Nullable`1& debuggerResumeAction)

   at Microsoft.PowerShell.EditorServices.PowerShellContext.ExecuteCommandInDebugger[TResult](PSCommand psCommand, Boolean sendOutputToHost)

   at Microsoft.PowerShell.EditorServices.PowerShellContext.<ExecuteCommand>d__48`1.MoveNext()"

which means nothing to me.

I am working off an example from RvdNieuwendijk

Ideas anyone?