This is Pega 7.3.1 using Apache Tomcat and MSSql with split schema. I created the new application from the PegaRules designer studio by clicking the "Build Application" button from the Home tab. It gives me the user accounts I created and I logout and login as the new application Admin and try to create the case and it gives me the error. It gives the same error in Designer Studio and Pega Express.
I have seen earlier with some other customer similar kind of issue and the issue happened due to the fact that someone by mistake deleted the DB table . Not sure whether the same thing happened here or not