org.hibernate.MappingException: Could not instantiate id generator [entity-name=XYZEntity]

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Could not instantiate id generator [entity-name=com.pronto.mpds.entity.MexpFeedError]
org.hibernate.MappingException: Could not instantiate id generator [entity-name=XYZEntity]
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:123)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:195)
at org.hibernate.internal.SessionFactoryImpl.(SessionFactoryImpl.java:318)
at org.hibernate.ejb.EntityManagerFactoryImpl.(EntityManagerFactoryImpl.java:96)

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