Step 5. Errors & Console

This code contains a deliberate error that is currently rendered inactive by making it a "comment".

Remove the comment marker to make it active code. Then see how the Ancient Brain editor flags it (but allows you to save it) and it is also flagged in the console when you run. To access the console press something like Ctrl-Shift-J (or Command-Option-J or F12, depending on your browser).