QML error is showing when opening project and gone error after edit and save file

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    visible: true
    width: 640
    height: 480    
    property variant tbl: ["℃"]    

    Text {
        y: 0
        text: tbl[0]
    }    //
    onActiveFocusItemChanged: {
        console.debug("activeFocusItem: ", activeFocusItem) //<- main.qml:18: error: Expected token `,'
    }
}