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AbstractMethodError: org.jpox.PersistenceManagerImpl.makePersistent jpox-2.0-beta-5

Received the following error when using maven with jpox-2.0-beta-5

java.lang.AbstractMethodError: 
        org.jpox.PersistenceManagerImpl.makePersistent
            (Ljava/lang/Object;)Ljava/lang/Object;
	at ...
	at sun.reflect.NativeMethodAccessorImpl.
            invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.
            invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.
            invoke(DelegatingMethodAccessorImpl.java:25)

I have not yet solved this problem, but it seems as though my persistence manager is not able to store my items. It's a shame the error message is not more descriptive, because now I have to go read the code for JPOX. I'll report more when I know the solution. I had to hack together a maven plugin for JPOX 2.0 beta 5 this morning, and that seems to be working very well, except I'm getting this strange error.