Warning
It appears that you do not have a Mail Host object deploy in your
Zope acquisition path. An Issue Tracker needs one to be able to send out emails
when that becomes necessary. Either go back and create one first (recommended)
or create one inside the Issue Tracker that you're now about to create.
The recommended name to use is: MailHost
It is highly recommended that you go through the Properties Wizard the first time since it will prepare many of internal properties depending on how you intend to use this IssueTracker.