TypeError: Cannot read property ‘source’ of undefined

[stereoMatching]

Using loader to load the component but always get error(warning?or just a state report?) message

main.qml

import QtQuick 2.1
    import QtQuick.Controls 1.0
    import QtQuick.Layouts 1.0
    import QtQuick.Dialogs 1.0
 
    Rectangle {
        width: 100
        height: 62
 
        ImageView{
            id:imView
 
            anchors.fill: parent
        }
 
        Image{
            anchors.fill: parent
           //this is where the problem come from
            source: imView.getCurrentFile()
        }
    }

import QtQuick 2.1
    import QtQuick.Controls 1.0
    import QtQuick.Layouts 1.0
    import QtQuick.Dialogs 1.0
     
    Rectangle {
        width: 100
        height: 62
     
        ImageView{
            id:imView
     
            anchors.fill: parent
        }
     
        Image{
            anchors.fill: parent
           //this is where the problem come from
            source: imView.getCurrentFile()
        }
    }

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ImageView

import QtQuick 2.0
    import QtQuick.Controls 1.0
    import QtQuick.Layouts 1.0
 
    Rectangle {
        width: 100
        height: 62      
 
        function appendFiles(files){
            for(var i = 0; i != files.length; ++i){
                filesModel.append({"source": files[i]})
            }
        }
 
      //this is where the problem come from
        function getCurrentFile(){
            if(loader.status == Loader.Ready){
                return filesModel.get(loader.item.currentRow).source
            }
 
            return "-1"
        }
 
        ListModel{
            id: filesModel
        }
 
        Loader{
            id: loader
 
            sourceComponent: tableViewHeavyComponent
        }
 
        Component{
            id: tableViewHeavyComponent
 
            Rectangle{
 
            }
        }
    }

import QtQuick 2.0
    import QtQuick.Controls 1.0
    import QtQuick.Layouts 1.0
     
    Rectangle {
        width: 100
        height: 62      
     
        function appendFiles(files){
            for(var i = 0; i != files.length; ++i){
                filesModel.append({"source": files[i]})
            }
        }
     
      //this is where the problem come from
        function getCurrentFile(){
            if(loader.status == Loader.Ready){
                return filesModel.get(loader.item.currentRow).source
            }
     
            return "-1"
        }
     
        ListModel{
            id: filesModel
        }
     
        Loader{
            id: loader
     
            sourceComponent: tableViewHeavyComponent
        }
     
        Component{
            id: tableViewHeavyComponent
     
            Rectangle{
     
            }
        }
    }

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Could I safely omit this error message, if not
how should I deal with it?