The user interface receives a communication error: CORBA OBJECT_NOT_EXIST

Problem:
When accessing screens in the Risk Management user interface, an error similar to:
A communication error occurred while retrieving data. java.rmi.NoSuchObjectException: CORBA OBJECT_NOT_EXIST is received. 
Symptom:
The Risk Management user interface requires access to other enterprise applications, such as the Risk Management engine and user interface EJBs.
Solution:
Verify that both the Risk Management engine (Risk_EJBEAR) and the User Interface EJB (RiskUI_EJBEAR) have started successfully.