javax.persistence.PersistenceException: [PersistenceUnit: Demo] Unable to build EntityManagerFactory

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javax.persistence.PersistenceException: [PersistenceUnit: Demo] Unable to build EntityManagerFactory
at org.hibernate.dialect.Dialect.getSequenceNextValString(Dialect.java:789)
at org.hibernate.id.SequenceGenerator.configure(SequenceGenerator.java:99)
at org.hibernate.id.SequenceHiLoGenerator.configure(SequenceHiLoGenerator.java:58)
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:118)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:190)
at org.hibernate.internal.SessionFactoryImpl.(SessionFactoryImpl.java:305)
at org.hibernate.ejb.EntityManagerFactoryImpl.(EntityManagerFactoryImpl.java:76)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:907)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:887)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
at undefined.ModifyArtistClient.main(ModifyArtistClient.java:8)

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