Error Messages Appear When You Modify Recurring Event Start and End Times

To resolve this issue, instead of attempting to modify a recurring event, create a new recurring appointment, configure the recurrence pattern, the start and end times, reminders, and so forth:

1. Start Outlook 2002, and then click Calendar.
2. On the Actions menu, click New Recurring Appointment.
3. Configure the details of the event as desired.
4. When you finish, click Save and Close.

 http://support.microsoft.com/kb/278197