[Zope] First run TypeError

Hi. I have been experimenting with making a hybrid storage for zodb. The storage seems to work well except that I am getting this error on the first request to the server and I am not exactly sure where it is coming from. Error Type: TypeError Error Value: unbound method method_descriptor object must be called with Application instance as first argument (got RequestContainer instance instead) When I refresh the browser, I get my login and no problems at all using the zope instance etc. The event and error logs are clean. But when I restart the server, the error appears on startup again. Many thanks. Regards, David