how to resolve " Error: Cannot assign [undefined] to QString "

[Qt embedded developer]

while i am running below code and select files i am getting below error:
qrc:/main.qml:38: Error: Cannot assign [undefined] to QString

import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.5
import QtQuick.Dialogs 1.3

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("FileDialog Demo")


    Column{
        spacing:20
        anchors.centerIn: parent

        Button{
            text: "Choose File or folder"
            anchors.horizontalCenter: parent.horizontalCenter
            onClicked: {
                fileDialogId.open()
            }
        }
        Text {
            id: textID
            text: "Use hasn't chosen yet"
            wrapMode: Text.Wrap
        }

        FileDialog{
            id: fileDialogId
            title: "Choose File or Folder"
            // this dialog only allow to select folder
            selectFolder: false
            selectMultiple: true

            onAccepted: {
                textID.text = fileUrls[3]

                for(var i = 0; i < fileUrls.length ; i++){
                    console.log("Value "+ i + "is: "+ fileUrls[i])
                }

            }

            onRejected: {

            }
        }



    }
}

[Qt embedded developer]

@Qt-embedded-developer

Sorry i have found that my above code is working and its give above error when i select file less than 4

[JonB]

@Qt-embedded-developer
Would you like to tell us which is line #38?

textID.text = fileUrls[3]

What value does fileUrls[3] have? You're sure it's defined?

[Qt embedded developer]

@JonB yes line 38 is

textID.text = fileUrls[3]

and its not defined i am selecting files from opened filedialog.

Actually i want to iterate and print selected file list from file dialog .

so can anybody help me to print it

[Qt embedded developer]

@Qt-embedded-developer

Sorry i have found that my above code is working and its give above error when i select file less than 4