[Zope] The let Tag.

[picasso@videotron.ca]

I tried to follow the example of a let tag in "DTML User's Guide". I tried
made a DTML Method with the following code:

<dtml-in "1,2,3,4">
<dtml-let num=sequence-item
          index=sequence-index
          result="num*index"
<dtml-var num> * <dtml-var index> = <dtml-var result>
</dtml-let>
</dtml-in>

When I click on Change, I have the message:
invalid parameter: " 

Similarly, I tried the example in the HOW-TO: let Tag:

<dtml-let name="bob">
          relation="uncle"
   <dtml-var name> is your <dtml-var relation>
</dtml-let>

I can click on Change, the problem is when I go the URL of the method, I
get message:

Zope Error
Zope has encountered an error while publishing this resource. 

Error Type: NameError
Error Value: bob


...What's wrong?