Can't load iterator.slate

[Pupeno]

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When trying to load iterator.slate using the lattest CVS HEAD, I get the 
following error:

Slate 1> load: 'src/lib/iterator.slate'.
Loading 'src/lib/iterator.slate'
The following condition was signaled:
The method was not defined by a child object as required.

I'm trying to load this since I thought it provided the method contents I need 
for the lattests src/ui/region.slate:
Slate 1> load: 'src/ui/init.slate'.
Loading 'src/ui/init.slate'
Loading 'src/ui/color.slate'
Loading 'src/ui/event.slate'
Loading 'src/ui/region.slate'
The following condition was signaled:
The method #contents was not found for the following arguments:
{(globals. Graphics. Types. traits. Mixins. VM. prototypes)}

I've tried inspecting the stack frame, but I couldn't understand it. It seems 
that there's a method or something that should be reimplemented but it's not 
being done, but I couldn't locate what.
Maybe I am mistaken, can anybody enlight me ?
Thank you.
- -- 
Pupeno: pupeno at pupeno.com - http://www.pupeno.com

PS: Should I do my SDL development on 0.3.1 instead of CVS HEAD ?
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