Elakadtam valaki segít? (Python Kivy GUI)

valamiért ezt írja ki

ja és linuxon Ubuntu 20.04

Qt: Session management error: None of the authentication protocols specified are supported

erre a kódra

from kivy.app import App

from kivy.uix.label import Label

from kivy.uix.screenmanager import Screen,ScreenManager

from kivy.lang import Builder

Builder.load_string("""

<RegisterScreen>

FloatLayout:

Button:

text: "Hello World"

""")

class RegisterScreen(Screen):

pass

class LoginScreen(Screen):

pass

class Main(App):

def build(self):

sm = ScreenManager()

sm.add_widget(LoginScreen(name= "login"))

sm.add_widget(RegisterScreen(name= "register"))

return sm

Main().run()