Hello, I try to write a Zope-Product and I always get following Error: Error Type: UnpickleableError Error Value: Cannot pickle objects The problem is the following line in the __init__ method of the class: self.menuHeader = HTML('<table>',globals()) I thought it should be possible as the class HTML inherits from Persistent or is it impossible to include objects in the first place. Thanks for any help! arne ######################################### from OFS.SimpleItem import SimpleItem import Persistence from Globals import HTML class AmazingMenu(SimpleItem,Persistence.Persistent): title = "Amazing Menu Tree" meta_type = 'Amazing Menu' manage_options = ( { 'label':'Tree','action':'manageTree' }, { 'label':'Header','action':'manageTemplates' }, { 'label':'Settings','action':'manageSettings' }, { 'label':'Consistency Check','action':'consistencycheck' }, ) def __init__(self,id): self.id = id self.menuHeader = HTML('<table>',globals()) self.link_target = '' return . . . . def manageAddAmazingMenuForm(self,REQUEST): o = AmazingMenu('amazing_menu') self._setObject('amazing_menu',o) return "abcd" #####################################