[Python] Black Screen when I try to use Ursina on Python

This is the code that I used

from ursina import *


Entity(model='quad', scale=60, texture='assets/blue_sky')
app = Ursina()

app.run() # opens a window and starts the game.






When I run the code, I get a black screen with nothing on it. Is there a way to fix this?

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