[Zope] Adding a ZClass instance fail

[nienfeng]

hi, every one
    I'm a novice to zope. when I follow the example of zoopBook2.7 
(http://www.plope.com/Books/2_7Edition/CustomZopeObjects.stx#2-47), I 
failed in adding ZClass instance. And the errlog is below.
    Can someone tell me what's wrong or how sould I to fix it or where 
to find the answer. Thanks.

by nienfeng


Exception Value 	default __new__ takes no parameters

Traceback (innermost last):

    * Module ZPublisher.Publish, line 121, in publish
    * Module Zope2.App.startup, line 240, in commit
    * Module transaction._manager, line 96, in commit
    * Module Products.CPSCompat.PatchZODBTransaction, line 175, in commit
    * Module transaction._transaction, line 433, in _commitResources
    * Module ZODB.Connection, line 484, in commit
    * Module ZODB.Connection, line 526, in _commit
    * Module ZODB.Connection, line 553, in _store_objects
    * Module ZODB.serialize, line 407, in serialize
    * Module ZODB.serialize, line 416, in _dump
    * Module copy_reg, line 70, in _reduce_ex

TypeError: default __new__ takes no parameters

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.zope.org/pipermail/zope/attachments/20061213/d8899aef/attachment.htm