OTClient ScrollablePanel not working

[Syl4s]

Could someone help me, the scrollbar is not working and is returning the error below.



The scrollbar in addons.ui is not working

shop.otui

MainWindow
  id: shopWindow
  !text: tr('Shop')
  size: 480 340

  @onEnter: modules.game_shop.hide()
  @onEscape: modules.game_shop.hide()

  TabBarVertical
    id: shopTabBar
    anchors.top: parent.top
    anchors.left: parent.left
    anchors.bottom: closeButton.top

  Panel
    id: shopTabContent
    anchors.top: shopTabBar.top
    anchors.left: shopTabBar.right
    anchors.right: parent.right
    anchors.bottom: closeButton.top

  Button
    id: closeButton
    anchors.bottom: parent.bottom
    anchors.right: parent.right
    !text: tr('Close')
    width: 90
    @onClick: modules.game_shop.hide()

addons.otui

AddonButton < UIButton
  width: 97
  height: 121
  margin-left: 20
  margin-bottom: 20

ScrollablePanel
  ScrollablePanel
    id: mainPanelScrollbar
    vertical-scrollbar: mainPanelScrollbar

  VerticalScrollBar
    id: mainPanelScrollbar
    anchors.top: parent.top
    anchors.bottom: parent.bottom
    anchors.right: parent.right
    margin-left:-20
    minimum: 0
    maximum: 100
    step: 12
    pixels-scroll: true

  AddonButton
    id: box1
    image-source: /modules/game_shop/images/buttonimg/addon_espaceex
    anchors.top: parent.top
    anchors.left: parent.left
    @onClick: modules.game_shop.buyExpaceEx()
  AddonButton
    id: box2
    image-source: /modules/game_shop/images/buttonimg/addon_barbarian
    anchors.top: prev.top
    anchors.left: prev.right
    @onClick: modules.game_shop.buyBarbarian()
  AddonButton
    id: box3
    image-source: /modules/game_shop/images/buttonimg/addon_snakeness
    anchors.top: prev.top
    anchors.left: prev.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box4
    image-source: /modules/game_shop/images/buttonimg/addon_theking
    anchors.top: prev.top
    anchors.left: prev.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box5
    image-source: /modules/game_shop/images/buttonimg/addon_aqua
    anchors.top: prev.top
    anchors.left: prev.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box6
    image-source: /modules/game_shop/images/buttonimg/addon_vikitrig
    anchors.top: box1.bottom
    anchors.left: parent.left
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box7
    image-source: /modules/game_shop/images/buttonimg/addon_lancer
    anchors.top: box2.bottom
    anchors.left: box1.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box8
    image-source: /modules/game_shop/images/buttonimg/addon_exploshion
    anchors.top: box3.bottom
    anchors.left: box2.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box9
    image-source: /modules/game_shop/images/buttonimg/addon_beggar
    anchors.top: box4.bottom
    anchors.left: box3.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box10
    image-source: /modules/game_shop/images/buttonimg/addon_beggar
    anchors.top: box5.bottom
    anchors.left: box4.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box11
    image-source: /modules/game_shop/images/buttonimg/addon_beggar
    anchors.top: box6.bottom
    anchors.left: parent.left
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box12
    image-source: /modules/game_shop/images/buttonimg/addon_beggar
    anchors.top: box7.bottom
    anchors.left: box1.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box13
    image-source: /modules/game_shop/images/buttonimg/addon_beggar
    anchors.top: box8.bottom
    anchors.left: box2.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box14
    image-source: /modules/game_shop/images/buttonimg/addon_beggar
    anchors.top: box9.bottom
    anchors.left: box3.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box15
    image-source: /modules/game_shop/images/buttonimg/addon_beggar
    anchors.top: box10.bottom
    anchors.left: box4.right
    @onClick: modules.game_shop.buyBeggar()
  AddonButton
    id: box16
    image-source: /modules/game_shop/images/buttonimg/addon_beggar
    anchors.top: box11.bottom
    anchors.left: parent.left
    @onClick: modules.game_shop.buyBeggar()