[Python] Why would the python code throw an exception (invalid instance in App.root), if...

Why would this code work in PyCharm:

from kivy.app import App
from kivy.uix.label import Label


class MainApp(App):
@property
def build(self):
return Label(text="Hello, World!")


MainApp().run()


But it will not, if I remove '@property'. This example was taken from KIVY site and run on PyCharm. Is it because of the PyCharm that this decorator is needed? The two AI agents on Edge and Chrome were emphatic that @operator is not needed. If I remove '@operator', it throws an exceptio

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