Kivy python not rendering any widget?

Question

Python

Good afternoon, I'm trying to run Kivy on linux Mint. The code is the simplest:

from kivy.app import App
from kivy.uix.button import Button

class MyFirstProgramApp(App):
    def duild(self):
        return Button(text = "Hello world!")

if __name__ == '__main__':
    MyFirstProgramApp().run()

The result is just a black screen. I wanted to get a button with an inscription, changed it to Label - the same thing, just a black screen. Everything seems to be fine in the console, no errors. I have already installed a bunch of additional libraries, but nothing is displayed.

Answer 1

class MyFirstProgramApp(App):
    def duild(self):
        return Button(text = "Hello world!")

duild -> build