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org.hibernate.MappingException: Unknown entity: org.dspace.app.requestitem.RequestItem	at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1146)	at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1403)	at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:208)	at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:497)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:118)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)	at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:772)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:746)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:750)	at sun.reflect.GeneratedMethodAccessor406.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:352)	at com.sun.proxy.$Proxy147.persist(Unknown Source)	at org.dspace.core.AbstractHibernateDAO.create(AbstractHibernateDAO.java:35)	at org.dspace.app.requestitem.RequestItemServiceImpl.createRequest(RequestItemServiceImpl.java:43)	at org.dspace.app.xmlui.aspect.artifactbrowser.SendItemRequestAction.act(SendItemRequestAction.java:117)