Uncaught TypeError

Question

Other browser working fine. But sololearn said type error. They can't read AddEventListener Property! How to solve this problem?
https://code.sololearn.com/WOPxuNxHXTJd/?ref=app

Answer 1

Just right whole JavaScript code inside
Window onload
window.onload=()=>{
//Your code goes here
}
Reason:
Your HTML contens load before the JavaScript so you have to write JavaScript code inside the window.onload function so your Javascript code will execute after loading HTML contents.

Answer 2

Beauty Thanks❤️