>line 23, in IWorkspace     value_type=Object(title=u"Object",
> description=u"adsf"),
in zope/schema/_field.py
class Object(Field):
    __doc__ = IObject.__doc__
    implements(IObject)
    def __init__(self, schema, **kw): <---- you need to pass a schema as a non
key-word
        if not IInterface.providedBy(schema):
            raise WrongType
Sincerely,
Mats Nordgren