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Unexpected exception
java.lang.NoSuchMethodError: org.datanucleus.plugin.PluginManager.<init>(Lorg/datanucleus/PersistenceConfiguration;Lorg/datanucleus/ClassLoaderResolver;)V	at org.datanucleus.OMFContext.(OMFContext.java:159)	at org.datanucleus.enhancer.DataNucleusEnhancer.(DataNucleusEnhancer.java:172)	at org.datanucleus.enhancer.DataNucleusEnhancer.(DataNucleusEnhancer.java:150)	at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1157)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:74)	at com.google.appengine.tools.enhancer.Enhance.(Enhance.java:71)	at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:51)