How do I fix this error?(js , canvas)

Question

hello.
this is my code.
How do I fix this error?
https://code.sololearn.com/WymV2uKcYPQ6/?ref=app
https://code.sololearn.com/WymV2uKcYPQ6/?ref=app

thanks for help🌹

Answer 1

The js code is running before the document loads,.
so you need to wait untill the page loads and then run the js code.

window.onload = () => {
//your code
}

Answer 2

Welcome

Answer 3

thanks🌹