How to see what error is the red ball pointing?

Hello.

I was coding my discord.js bot, when I saw the red ball in one of the line of my code. But how can I see what is the error?

Hi @TheBigerGamer, if there’s an error in your code the point of the error on that line should be noted with a squiggly red underline. Hover over the underline and you’ll see the problem described.

https://support-assets.glitch.me/red-dot-error shows what I mean.