PlateSystem does not have its IJPlate attributes set.
The Plate properties were not set properly. These properties include the Plate Type (Hull, Deck, BulkHead), the Tightness (NonTight, WaterTight), and the naming rule.
Plates may not be properly updated.
What You Should Do
Select the Root Plate System, and edit the plate properties on the property page.
Re-run the Check Database Integrity custom command to verify that this error has been fixed.