Button on CoreS3 not working

[ps.oz]

Using UiFlow2 alpha-17
I have a button on CoreS3 on black port B
I try to retrieve its value
I get an error hardware/button.py line 25 in isHolding
AttributeError 'super' object has no attribute 'last_state'

Here's the code

import os, sys, io
import M5
from M5 import *
from unit import *

title0 = None
label0 = None
dual_button_0_blue = None
dual_button_0_red = None

isHold = None

def setup():
global title0, label0, dual_button_0_blue, dual_button_0_red, isHold

dual_button_0_blue, dual_button_0_red = DualButton((8, 9))
M5.begin()
Widgets.fillScreen(0x222222)
Widgets.fillScreen(0x222222)
title0 = Widgets.Title("Title", 3, 0xFFFFFF, 0x0000FF, Widgets.FONTS.DejaVu18)
label0 = Widgets.Label("Text", 20, 76, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu18)

title0.setText('Main')
isHold = 0

def loop():
global title0, label0, dual_button_0_blue, dual_button_0_red, isHold
M5.update()
isHold = dual_button_0_blue.isHolding()
label0.setText(str((str(isHold))))

if name == 'main':
try:
setup()
while True:
loop()
except (Exception, KeyboardInterrupt) as e:
try:
from utility import print_error_msg
print_error_msg(e)
except ImportError:
print("please update to latest firmware")