B4J Question Map and LinkedHashMap

Private Sub sioserver_set_audio_configuration(sock As NettySocketWrapper, value As Object, ack As AckRequest)
    Log($"Event set_audio_configuration"$)
    If (ack <> Null) Then
        If (ack.isAckRequested) Then Log("Acknowledge required") Else Log("Acknowledge not required")
    Else
        Log("ack is null")
    End If
    If (value<>Null) Then
        Dim valtype As String = GetType(value)
        Log($"value type = ${valtype}"$)
      
        If (valtype.Contains("Map")) Then
            Dim valuemap As Map = value.As(Map)
            If (valuemap.IsInitialized) Then
                If (valuemap.Size>0) Then
                    Log($"valuemap size = ${valuemap.Size}"$)
                  
                    For Each kk As String In valuemap.Keys
                        Log($"Key = ${kk}, Value = ${valuemap.Get(kk)}"$)
                    Next
                Else
                    Log("Valuemap size = 0")
                End If
            Else
                Log("Valuemap not initialized")             
            End If
        Else if (value Is String) Then
            Log("value is string")
        Else
            Log("value is something else")
        End If
      
    Else
        Log($"set_audio_configuration value is null"$)
    End If
End Sub

Will raise sioserver_set_audio_configuration
jSocketIOServer StartListen at Port = 9000
Client Connected, ID = 6c598310-ea7a-43e2-b709-011ffdfba85d
Event get_network_configuration
get_network_configuration value is null
Event get_audio_configuration
get_audio_configuration value is null
valuetype = java.util.LinkedHashMap
value = {volume_input=0, volume_output=0, switchip=false}
Event set_audio_configuration
Acknowledge required
value type = java.util.LinkedHashMap
valuemap size = 3
Error occurred on line: 128 (Main)
java.lang.RuntimeException: method not supported. Use For Each instead.
    at anywheresoftware.b4a.objects.collections.Map.GetKeyAt(Map.java:114)
    at anywheresoftware.b4a.objects.collections.Map$IterableMap.Get(Map.java:184)
    at b4j.example.main._sioserver_set_audio_configuration(main.java:340)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:629)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

For ii = 0 To valuemap.Size-1
                        Log($"Key = ${valuemap.GetKeyAt(ii)}"$)
                        Log($"Value = ${valuemap.GetValueAt(ii)}"$)
                    Next