[Zope] TypeError trying to use Dtml-in on Zclass

[weboats@web-oats.com]

Hi All,

I have a Zclass object called States
built with folder and renderable

When I try

<dtml-in States>
<dtml-var sequence-item>
</dtml-in>


I get 
Error Type: TypeError
Error Value: hasattr, argument 2: expected string, int 
found


Does anyone know why this is happening?

Thank you for your help,

Kevin Smith