I've taken my method and cut away almost everything. Now why doesn't this work? def NewArticolo(self,REQUEST,RESPONSE): r='' upload = self.upload upload.manage_addFolder('nuovo_folder') r=r+ upload['nuovo_folder'].id + ' added.' upload['nuovo_folder'].manage_clone(upload['01.jpg'],'nuova_fotografia.jpg') return r I call it as an external method. "self" contains a folder called 'upload'. It gives me the following: Error Type: AttributeError Error Value: 'None' object has no attribute 'get' [...] File /var/lib/zope/Extensions/upload.py, line 35, in NewArticolo (Object: ElementWithAttributes) File /usr/lib/zope/lib/python/OFS/CopySupport.py, line 284, in manage_clone (Object: ElementWithAttributes) File /usr/lib/zope/lib/python/OFS/CopySupport.py, line 362, in _verifyObjectPaste (Object: ElementWithAttributes) AttributeError: (see above) If I comment out the .manage_clone, the .id works and prints out "nuovo_folder added" (but I don't see the folder in the management interface). Why must life be so hard? Thanks.