[Zope] Can't create a MailHost

[Arkaitz]

Hello Zopers,
	I tried to create a Mail Form as the How-To describes it, but it its
impossible for me to get the first step done, creating the MailHost object.
When I push the ADD button on the form to create the MaiilHost, it gives me
back this error:
	Error Type : KeyError
	Error Value:  manage_addMailHost

I am running RedHat 6.0 with Python 1.5.2 and Zope 2.0b3.
In the form to configure the MailHost I put the local host  as the SMTP
host, in which I have sendmail running at port 25.

Thanks in advance,

- Arkaitz.