Yesod: Stuck in book "Seven Web frameworks in seven weeks"

I installed Yesod according to the quick start guide.

I bought the book "Seven Web frameworks in seven weeks" and I'm trying to follow along. I'm on page 204 (Day 1: Working with models). When I enter

ghci Model.hs

look what happens.

I'm stuck. I'm new to Haskell and Yesod, so I don't know what to do.

Please, help.

Thank you very much in advance.

Anthony