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Q: 

Provider error. Provider: org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider

I am using Google App Engine Eclipse Plugin and in a project I try to create entity manager using jpa. but eclipse gives me the error "Provider error. Provider:org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider" How can I solve this issue?

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