How to use singleton in another singleton

Hello, I’m using Qt 5.3.2 and I tried to use singleton object in another singleton object in the same directory. But the program exited with code -1. It is a situation such as the following. (this is just an example) Directory structure root [directory]   |-Test.qml   (Window)   |-singletons [directory]       |-qmldir       |-Colors.qml (Singleton)       |-Red.qml    (Singleton)       |-Green.qml  (Singleton) ———————————————— qmldir singleton Colors Colors.qml singleton Red Red.qml singleton Green Green.qml ———————————————— Colors.qml pragma Singleton import QtQuick 2.0   QtObject {     readonly property color colorR: "#FF0000"     readonly property color colorG: "#00FF00"     readonly property color colorB: "#0000FF" } ———————————————— Red.qml pragma Singleton import QtQuick 2.0 import '.'   QtObject {     readonly property color color1: Colors.colorR } ———————————————— Green.qml pragma Singleton import QtQuick 2.0 import '.'   QtObject {     readonly property color color1: Colors.colorG } ———————————————— Test.qml: import QtQuick 2.3 import QtQuick.Controls 1.2 import 'singletons'   ApplicationWindow {     width: 640     height: 480       Rectangle {         anchors.centerIn: parent         width: 100         height: 100         color: Red.color1     } } ———————————————— Red.qml and Green.qml are using Colors.qml by importing ‘.’. I think this part is something wrong. The program works fine if I remove import '.' from Green.qml. But I will not be able to use Green.color1 in Test.qml. Please can anyone help me with this issue? Thanks.