Hi, When I creat zope products with zclasses, First I create a product and with the specified name: "HRsystem" under the directory of Control_Panel/Products Folder. Then Click "Add" and then "Generate", Go to "HTsystem" Product Folder and create a ZClass by selecting "Z Class" form the product add list. I select all of the "Base classes" that listed .... Then when I want to add a instance of "HRsystem" under /Victor directory.Zope give some errors like this: Zope Error Zope has encountered an error while publishing this resource. Error Type: TypeError Error Value: argument name was ommitted Troubleshooting Suggestions The URL may be incorrect. The parameters passed to this resource may be incorrect. A resource that this resource relies on may be encountering an error. For more detailed information about the error, please refer to the HTML source for this page. If the error persists please contact the site maintainer. Thank you for your patience. ---------- But when I select none of the base classes.It work properly.. regards Victor zhai "WorldSecure Server <ogilvy.com>" made the following annotations on 09/28/99 23:00:51 ------------------------------------------------------------------------------ Privileged/Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such case, you should destroy this message and kindly notify the sender by reply email. Please advise immediately if you or your employer does not consent to email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of the Ogilvy Group shall be understood as neither given nor endorsed by it. ==============================================================================