Meaning: The connection between the Plate System being detailed and one of its boundaries is missing. Detailed parts cannot be generated on this system. A Connection between the Plate System and its boundary has been deleted or a bounding object either needs to be updated or no longer touches the bounded object.
Verify that the boundaries are not on the To Do List and require updating.
After updating the boundaries, perform a re-compute on this object.
If unrepairable, report the steps taken to your support group.