Only one root object is allowed by .kv

[Luigi Marongiu]

Hello,

I used to have a file where I instantiate a widget; I tried to remove it and use screens to handle different screens. But I got this error:

```

...

...

       5:    SleepOn:

       6:        name: "sleep_on"

 >>    7:sleep_on:

       8:    BoxLayout:

       9:        orientation: "vertical"

 ...

 Only one root object is allowed by .kv

```

I have defined three screens, of which one is the window manager (if it is compulsory, I am not sure). In the class `ClockApp`, which before was returning the widget, I returned now the kivy file:

```

class ClockApp(App):

    def build(self):

        return Builder.load_file("./clock.kv")

```

Even if I simply define build(self) as `pass`, I still get the error.

How can I define a single root?

[Elliot Garbus]

I’m assuming you wanted the code below.

I commented out the WakeCall Screen, there is nothing defined for it yet.

WindowManager is the root widget.  It is in the far left column.  <SleepOn> is a rule.

 

 

#:kivy 1.10.1
WindowManager:
#    WakeCall:
#        name: "wake_call"
    SleepOn:
        name: "sleep_on"

<SleepOn>:
    BoxLayout:
        orientation: "vertical"
        size: root.width, root.height
        cols: 1
        GridLayout:
            pos_hint: {'center_x':.5}
            cols: 3
            rows: 1
            ImageButton:
                size_hint_x: 1
                size_hint_y: 0.8
                source: "./sleepy.jpg"
                on_release:
                    h_clock.cancel_time()
                    self.source = './awake.jpg'
                    h_clock.text = "BEEP"
        clockLabel:
            id: h_clock
            size_hint_x: 1
            size_hint_y: 0.2
            font_size: 85
            color: 0, 1, 1, 1
            bold: True
            text: self.current_time

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[Luigi Marongiu]

Thank you!

> To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/5eca8d15.1c69fb81.2b55c.9e30SMTPIN_ADDED_MISSING%40gmr-mx.google.com.



--
Best regards,
Luigi