Hi Art
Here are a few things I would like you to check:
1. Do a show all on the Team tab and ensure that Rate/Cost matrix covers and is defined for not only the labor but non labor - material, equipment and expense as well. It should also cover the inactives.
2. The rows in the matrix should cover the start and end date of the project and not just the task.
One of these should be the reason for the error.
Thanks
Shailey