Why error in js part please help

Question

https://code.sololearn.com/WaQWl58stSDk/?ref=app

Answer 1

Here's a quick fix:

https://code.sololearn.com/W5mA7XAQbd3A/?ref=app

Tony Sharma(Haryanvi)

Answer 2

But I can't see any error🤔
U should add window.onload if you are facing any error