[Zope] ZopeTime Error

[bak (kedai)]

>     (Object: getMonthItem(start_date=ZopeDate))
>     (Info: ZopeDate)
>   File <string>, line 0, in ?
>   File /usr/local/zope/lib/python/Shared/DC/ZRDB/DA.py, line 482, in
> __call__ (Object: getMonthItem)
>   File /usr/local/zope/lib/python/DocumentTemplate/DT_String.py, line 538,
> in __call__
>     (Object: <string>)
>   File /usr/local/zope/lib/python/OFS/DTMLMethod.py, line 182, in __call__
>     (Object: ZopeDate)
>   File /usr/local/zope/lib/python/DocumentTemplate/DT_String.py, line 538,
> in __call__
>     (Object: ZopeDate)
>   File /usr/local/zope/lib/python/DocumentTemplate/DT_Var.py, line 278, in
> render
>     (Object: ZopeTime())
>   File /usr/local/zope/lib/python/DocumentTemplate/DT_Util.py, line 334, in
> eval
>     (Object: ZopeTime())
>     (Info: ZopeTime)
>   File <string>, line 0, in ?
> NameError: (see above)


name error suggests that the requested object is not found (methinks).  what 
does ZopeDate do?