renderContentOn: Generating Confusing Error

> Hi, I have the following #renderContentOn: method from an online tutorial:
>
> renderContentOn: html
>         html heading: 'Contacts' level: 1.
>         self addressBook contacts do:
>                         [ :contact |
>                                 (html div) class: ('row');
>                                 with: [ (html anchor)
>                                                         callback: [ self showContact: contact ]; with: (contact
> firstName , ' ', contact surname ) ]].
>
>         html form:
>                         [(html span)
>                                 class: 'button';
>                                 with: [html submitButton on: #addContact of: self]]
>
> I'm getting the following exception stack when it is executed:
>
> Stack Trace
>
> thisContext
> True(Object)>>doesNotUnderstand:
> self
> true
> aMessage
> a Message with selector: #firstName and arguments: #()
> excpt
> a MessageNotUnderstood
> resumeValue
> nil
>
> thisContext
> optimized [] in [] in MyAddressBookView>>renderContentOn:
> self
> BlockClosure [] in [] in MyAddressBookView>>renderContentOn:
> html
> a Seaside.WARenderCanvas
> self
> a MyAddressBookView
> contact
> true
>
> thisContext
> BlockClosure>>renderOn:
> self
> BlockClosure [] in [] in MyAddressBookView>>renderContentOn:
> aRenderer
> a Seaside.WARenderCanvas
>
> thisContext
> optimized [] in Seaside.WATagBrush>>with:
> self
> BlockClosure [] in Seaside.WATagBrush>>with:
> self
> a Seaside.WADivTag
> anObject
> BlockClosure [] in [] in MyAddressBookView>>renderContentOn:
>
> thisContext
> BlockClosure>>renderOn:
> self
> BlockClosure [] in Seaside.WATagBrush>>with:
> aRenderer
> a Seaside.WARenderCanvas
>
> >From the stack trace, it doesn't understand the following:
>
> contact firstName
>
> If anyone has any ideas as to what may be the issue here, please feel
> free to post.  I'm using Seaside 2.8 Beta, VW 7.5, and Mac OS 10.4.10.
>
> Thanks in advance,
>
> -Conrad
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