Как открыть фотографию в kivy с помощью filechooser?

class SaveLoad(FloatLayout):
    save = ObjectProperty(None)
    image = ObjectProperty(None)
    cancel = ObjectProperty(None)

class LoadDialog(FloatLayout):
    load = ObjectProperty(None)
    cancel = ObjectProperty(None)

class Root(FloatLayout):
    loadfile = ObjectProperty(None)
    image = ObjectProperty(None)

    def load(self, path, file):
        # та самая проблемная строка
        path = os.path.join(path, file[0])
        self.image.source = path
        dismiss_popup()

    def dismiss_popup(self):
        self._popup.dismiss()

    def openFile(self):
        if camera == 0:
            content = LoadDialog(load=self.load, cancel=self.dismiss_popup)
            self._popup = Popup(title="Open File", content=content, size_hint=(0.9, 0.9))
            self._popup.open()
        else :
            print("Error")

Root:
    BoxLayout:
        orientation: 'vertical'
        size_hint: (1, 1)
        GridLayout:
            cols: 1
            size_hint: (1, .2)
            Button:
                text: "Open\nfile"
                on_press: root.openFile()
        BoxLayout:
            orientation: "horizontal"
            padding: (190, 27)
            Image:
                id: image
                source: 'image/white-background.jpg'
                size_hint: (None, None)
                size: (300 ,300)
# Окно с файловым менеджером
<LoadDialog>:
    BoxLayout:
        orientation: 'vertical'
        size: root.size
        pos: root.pos
        FileChooserIconView:
            id: filechooser
            path: '~/'
        BoxLayout:
            orientation: 'horizontal'
            size_hint_y: None
            height: 40
            Button:
                text: "Close"
                on_press: root.cancel()
            Button:
                text: "Load File"
                on_press: root.load(filechooser.path, filechooser.selection)

File "/home/karacb/.local/lib/python3.7/site-packages/kivy/lang/builder.py", line 64, in custom_callback
     exec(__kvlang__.co_value, idmap)
   File "/home/karacb/Desktop/Python/kivy language/Informatik/findface.kv", line 63, in <module>
     on_press: root.load(filechooser.path, filechooser.selection)
   File "/home/karacb/Desktop/Python/kivy language/Informatik/indexCopy.py", line 74, in load
     self.image.source = path
 AttributeError: 'NoneType' object has no attribute 'source'