title: QQuickView only supports loading of root objects that derive from QQuickItem error?
body: <p>I wrote simple hello world using pyqt5.But when I start it I get error : </p>
  
  <pre><code>QQuickView only supports loading of root objects that derive from QQuickItem. 
  
  If your example is using QML 2, (such as qmlscene) and the .qml file you 
  loaded has 'import QtQuick 1.0' or 'import Qt 4.7', this error will occur. 
  
  To load files with 'import QtQuick 1.0' or 'import Qt 4.7', use the 
  QDeclarativeView class in the Qt Quick 1 module.
  </code></pre>
  
  <p>I tried to solve it but I guess I don't understand what happend.Can somebody explain me this error in more details and how can I solve it ? </p>
  
  <h1>Main.py:</h1>
  
  <pre><code>#!/usr/bin/python3.4
  
  
  from PyQt5.QtCore import *
  from PyQt5.QtGui import *
  from PyQt5.Qt import *
  from PyQt5.QtQuick import * 
  
  if __name__=='__main__':
      import os
      import sys
  
  
  class Main(QObject):
      def __init__(self,parent=None):
          super().__init__(parent)
          self.view=QQuickView()
          self.view.setSource(QUrl.fromLocalFile('main.qml'))
      def show(self):
          self.view.show()
  
  
  
  app=QApplication(sys.argv)
  main=Main()
  main.show()
  sys.exit(app.exec_())
  </code></pre>
  
  <h1>Main.qml</h1>
  
  <pre><code>import QtQuick 2.2
  import QtQuick.Controls 1.1
  import QtQuick.Window 2.0
  
  
  
  ApplicationWindow
  {
      signal btnPlayClicked()
      signal btnStopClicked()
  
  
  
      id:app
      width:Screen.desktopAvailableWidth
      height:Screen.desktopAvailableHeight
      color:"black"
  
  
      ToolBar{
              y:app.height-height
              height:btnPlay.height
                  Button
                          {
                                 id:btnPlay
                                 x:app.width/2-btnPlay.width
                                 text:"Play"
                                 onClicked: parent.parent.btnPlayClicked()
  
                          }
                  Button
                         {
                                 id:btnStop
                                 x:app.width/2
                                 text:"Stop"
                                 onClicked: parent.parent.btnStopClicked()
  
                         }
  
  
  
            }
  
  
  
  }
  </code></pre>