Cannot assign to property of unknown type "QString".

[Hungkv]

I dont know why I got error "Cannot assign to property of unknown type "QString"." when I using string property string and assign it to text property in Text, here is the qml file

import QtQuick
Item {
    id: root
    required property string title
    required property string data

    width: 200*D.w
    height: 30*D.h

    Rectangle {
        width: parent.width
        height: parent.height
        color: "transparent"

        Text {
            id: titleText
            text: title? title : "Undefined"
            wrapMode: Text.WordWrap
            width: parent.width/3
            height: parent.height
            anchors {
                left: parent.left
                top: parent.top
                bottom: parent.bottom
            }
            horizontalAlignment: Text.AlignHCenter
        }

        Text {
            id: dataText
            text: data ? data : "Undefined"
            wrapMode: Text.WordWrap
            width: parent.width*2/3
            height: parent.height
            anchors {
                left: titleText.right
                top: parent.top
                bottom: parent.bottom
            }
            horizontalAlignment: Text.AlignLeft
        }
    }
}

[Axel Spoerl]

Which Qt version are you using?
Which line in the QML code does the error message refer to?
I don't think it matters, but you should change the assignment line to

text: root.title ? root.title : "Undefined"

[dheerendra]

In addition what @Axel-Spoerl has already said, avoid using title, data as your properties. data is already as property in item. So confusing. Better use some other names.