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Class Cast Exception when viewing Process on the Activiti Administration page

Question asked by ankhara33 on Apr 26, 2013
Latest reply on Apr 29, 2013 by trademak
We've created a Transfer process which is somewhat complex, and has several different approval steps. When I login to the Activiti Explorer as an Administrator, I see this exception in the logs when selecting an instance of our 'Transfer' process to view the details of….

Caused by: java.lang.ClassCastException: org.activiti.engine.impl.persistence.entity.HistoricProcessInstanceEntity cannot be cast to org.activiti.engine.runtime.ProcessInstance
        at sun.reflect.GeneratedMethodAccessor2853.invoke(Unknown Source)

We have a couple of different versions of this process deployed… which I also need to look into. Any ideas what would cause this?