This week's book giveaways are in the Scala and Android forums. We're giving away four copies each of Machine Learning Systems: Designs that scale and Xamarin in Action: Creating native cross-platform mobile apps and have the authors on-line! See this thread and this one for details.
I think result should have a name parameter. That's the value you return from the action to determine which result to forward/redirect to. If there's more than one result for an action, how does it know which one to take?
Check the web site for the book. If it's an error, they usually have a correction on the site.