What causes "org.hibernate.hql.ast.QuerySyntaxException: ProcessInstanceInfo is not mapped"' while creating the jBPM human task sample project in JBDS ?

Issue

• I created a jBPM5 human task sample project in JBDS but when running ProcessTest it throws the following exception:

04/07 18:06:33,720[main] ERROR hibernate.impl.SessionFactoryImpl.<init>  - Error in named query: ProcessInstancesWaitingForEvent
org.hibernate.hql.ast.QuerySyntaxException: ProcessInstanceInfo is not mapped [select processInstanceInfo.processInstanceId from ProcessInstanceInfo processInstanceInfo join processInstanceInfo.eventTypes eventTypes where eventTypes = :type]
    at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:181)
...

Can you please advise what causes this ERROR?