Hello everybody!
I am having problems trying to register on my system ...
this error appears:

Exception in thread "AWT-EventQueue-0" java.lang.NoSuchMethodError: org.hibernate.event.PreInsertEvent.getSource()Lorg/hibernate/engine/SessionImplementor;
at org.hibernate.validator.event.ValidateEventListener.onPreInsert(ValidateEventListener.java:172)
at org.hibernate.action.EntityInsertAction.preInsert(EntityInsertAction.java:178)
at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:72)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:54)

I have no idea of what can be ...
I searched the forums but here in Brazil do not think the solution ...
If anyone can help, I'll be grateful ..
Thank you!