That Is a known issue with those databases. I will get your case over to our Book Support staff, however I will need a little bit more information so that I can get you a definitive answer.
I will need to know which book's lesson you are referring to. I assume it's the 70-433 Training Kit but I just wanted to be sure. If you can confirm that you are working out of that book that would be fantastic. I will then escalate your case to the expert here.
Customer Service Rep,