How do I incorporate the FitnessTrackerPlus.Web namespace in my silverlight client?

I am wrapping up with chapter three and have observed the following error when providing a using statement for namespace "FitnessTrackerPlus.Web.Data":

The type or namespace name 'Web' does not exist in the namespace 'FitnessTrackerPlus'

I observed that I cannot simply add the FitnessTrackerPlus.Web reference to my silverlight client's references.

Thanks in advance,
nimrod2000mill

I realized that the namespace definition did not exist.
Once I added the namespace again, everything worked out well.