I cannot see this problem in my files - this line is present in demo.lesson5.any. What version of AMS are you using? Do you do the tutorials from the web or locally installed? Could it be that you deleted this line accidentally?
Ok, sorry. Now I got it - it will be missing if you start working with the very first tutorial. I guess most of the users just start from the second one (where this line is present) since we have not heard about this problem before
Thank you for noticing it - we will change the tutorial to account for that.
Pavel