[rules-users] java.lang.RuntimeException: Unable to load session snapshot

Hi, I am using JPA session persistance. Everything is working fine, then a rule fires that detects an Event, and after that trying to recreate the session fails with a: Caused by: java.lang.RuntimeException: Unable to load session snapshot at org.drools.persistence.session.JPASessionMarshallingHelper.loadSnapshot(JPASessionMarshallingHelper.java:96) Can anyone help me with this ? Thanks