Hallo, I've got a very strange error. 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. I'm not understanding why there is a mistake only by viewing the properties. ->>>> Error Type: TypeError Error Value: len() of unsized object Traceback (innermost last): File C:\Zope\lib\python\ZPublisher\Publish.py, line 222, in publish_module File C:\Zope\lib\python\ZPublisher\Publish.py, line 187, in publish File C:\Zope\lib\python\Zope\__init__.py, line 221, in zpublisher_exception_hook (Object: ElementWithAttributes) File C:\Zope\lib\python\ZPublisher\Publish.py, line 171, in publish File C:\Zope\lib\python\ZPublisher\mapply.py, line 160, in mapply (Object: manage_propertiesForm) File C:\Zope\lib\python\ZPublisher\Publish.py, line 112, in call_object (Object: manage_propertiesForm) File C:\Zope\lib\python\App\special_dtml.py, line 121, in __call__ (Object: manage_propertiesForm) (Info: C:\Zope\lib\python\OFS/properties.dtml) File C:\Zope\lib\python\DocumentTemplate\DT_String.py, line 502, in __call__ (Object: manage_propertiesForm) File C:\Zope\lib\python\DocumentTemplate\DT_In.py, line 691, in renderwob (Object: propertyMap) File C:\Zope\lib\python\DocumentTemplate\DT_In.py, line 657, in renderwob (Object: getProperty(id)) TypeError: (see above)