What does this "Hint" mean?

[Preston Shea]

I pasted the doMenu example from the documentation:

on mouseUp

do menuItem "New Card" of menu "Object"

end mouseUp

And this error results:

Type Chunk: error in chunk expression

Object Button 1

Line do menuItem "New Card" of menu "Object"

Hint (&Object Inspector

Can anyone tell me what the "Hint" means and/or why this script doesn't work?