Showing error with 'addEventListener' ! Please help where to fix the bug actually?

Question

https://code.sololearn.com/W1w1YnONgvKg/?ref=app

Answer 1

window.onload=()=>{
// wrap js code
}

Answer 2

Reason is the js file reading before the web page load, so.

You're welcome.

Answer 3

I did it with the function() but it was not working though.. trying again as per your tip.. thanks

Answer 4

Forgot to mention the "=" operator before the function().. anyways thanks