Does this mean anything to anyone?

I found this, but I am using  5.5.0.Final:
http://drools.46999.n3.nabble.com/org-drools-reteoo-AlphaNode-AlphaMemory-cannot-be-cast-to-org-drools-reteoo-BetaMemory-td832213.html

java.lang.ClassCastException: org.drools.reteoo.BetaMemory cannot be cast to
org.drools.reteoo.AlphaNode$AlphaMemory
        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:136)
        at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
        at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:141)
        at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
        at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
        at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
        at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
        at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
        at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
        at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
        at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
        at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
...



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