Sven Hohage writes:
 > ....
 > I'm working with external methods and folder proprties. The methods are
 > iterating over properties
 > and adding or deleting items.
 > Until friday everything was fine.Now I got this error when I try to view
 > the properties.
 > ....
 > Error Type: TypeError
 > Error Value: len() of unsized object
 > Traceback (innermost last):
 >   ....
 >   File C:\Zope\lib\python\DocumentTemplate\, line 657, in
 > renderwob
 >     (Object: getProperty(id))
<dtml-in> gets an argument (probably "getProperty(id)") that is
not a sequence, it even does not support the "len" operation.

I assume that you somehow managed to assign a non-list value
(maybe None or a number) to a list valued property.


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