Hull Plate System does not have Shell Molded Conventions defined.
The shell molded conventions are not specified for a plate system of type Hull.
Plates and stiffeners might fail during processing. This situation can affect stiffener orientation and properties controlled by the default values for molded conventions.
What You Should Do
Select the root system, and edit the shell molded conventions on the Properties dialog box.
Re-run the Check Database Integrity custom command to verify that this error has been fixed.