[Zope] Manage-clone and anonymous role

Hello, I like anonymous users to add postings. For adding postings I use the Zope Book python-script with proxy-role manager ->zeit = context.ZopeTime() ->id = str(int(zeit)) ->exhibit=context.manage_clone(container.exhibitTemplate,id) ->exhibit.manage_changeProperties(title=title,ersteller=ersteller,erstellung sdatum=erstellungsdatum,email=email,text=text) But the anonymous user always gets: File Script (Python), line 11, in addPost File C:\Zopa\lib\python\OFS\CopySupport.py, line 333, in manage_clone (Object: Traversable) File C:\Zopa\lib\python\OFS\CopySupport.py, line 414, in _verifyObjectPaste (Object: Traversable) Unauthorized: Add Folders What could be the problem?? Thanks.