QML QQuickText: Cannot anchor to an item that isn't a parent or sibling - qt

Question

When I use TumblerColumn in my Tumbler, I get QML QQuickText: Cannot anchor to an item that isn't a parent or sibling, When I use Tumbler alone the error doesn't appear. I can't figure out what is the problem with TumblerColumn.
Here is my Dialog code
import QtQuick 2.9
import QtQuick.Controls 2.2
import QtQuick.Dialogs 1.2
import QtQuick.Extras 1.2
Dialog {
id: customTimerInputDialog
title: "Custom timer"
height: 150
width: 300
standardButtons: StandardButton.Ok | StandardButton.Cancel
onAccepted: {
}
onRejected: {
console.log("Rejected")
}
Column {
anchors.fill: parent
Text {
text: "Timer"
height: 40
}
Tumbler {
id: tumbler
TumblerColumn {
model: 10
}
TumblerColumn {
model: 60
}
}
}
}
TumblerColumn (TumblerStyle.qml) complete source code
...
// line 294
property Component delegate: Item {
implicitHeight: (control.height - padding.top - padding.bottom) / tumblerStyle.visibleItemCount
Text {
id: label
text: styleData.value
color: "#666666"
opacity: 0.4 + Math.max(0, 1 - Math.abs(styleData.displacement)) * 0.6
font.pixelSize: Math.round(TextSingleton.font.pixelSize * 1.25)
anchors.centerIn: parent
}
}
...
Error message
UPDATE
I get the same error with Popup QML Type
Popup {
id: popup
x: 100
y: 100
width: 200
height: 300
modal: true
focus: true
closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutsideParent
Tumbler {
id: intervalPicker
TumblerColumn {
model: 10
}
TumblerColumn {
model: 60
}
}
}

Answer 1

You are mixing Qt Quick Controls 1 and 2. In your Dialog/Popup you import
QtQuick.Controls 2.2 and QtQuick.Extras 1.2. Both imports define a Tumbler, but the one from Qt Quick Extras is made to work with Qt Quick Controls 1 (see the imports in TumblerStyle.qml).
If you want to use TumblerColumn and TumblerStyle, you have to use the Tumbler from Qt Quick Extras 1.2.
If you want to use the Tumbler from Qt Quick Controls 2, you cannot use any of the tumbler facility from Qt Quick Extras 1.2.
If you need to have both Qt Quick Extras 1.2 and Qt Quick Controls 2 imported in a qml file, you need to use the as qualifier:
import QtQuick.Extras 1.2 as Extra
import QtQuick.Controls 2.2 as Controls2
...
Extra.Tumbler
{
...
}
Controls2.Tumbler
{
...
}
...