weblogic.application.ModuleException: Exception preparing module: EJBModule(ejb1.jar)

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Exception preparing module: EJBModule(snapshot31.jar) [EJB:011023]An error occurred while reading the deployment descriptor. The error was:
weblogic.application.ModuleException: Exception preparing module: EJBModule(ejb1.jar)
at weblogic.deployment.BasePersistenceUnitInfoImpl.getPersistenceProvider(BasePersistenceUnitInfoImpl.java:375)
at weblogic.deployment.BasePersistenceUnitInfoImpl.initializeEntityManagerFactory(BasePersistenceUnitInfoImpl.java:393)
at weblogic.deployment.BasePersistenceUnitInfoImpl.initializeEntityManagerFactory(BasePersistenceUnitInfoImpl.java:386)
at weblogic.deployment.BasePersistenceUnitInfoImpl.(BasePersistenceUnitInfoImpl.java:158)
at weblogic.deployment.PersistenceUnitInfoImpl.(PersistenceUnitInfoImpl.java:39)
at weblogic.deployment.AbstractPersistenceUnitRegistry.storeDescriptors(AbstractPersistenceUnitRegistry.java:349)
at weblogic.deployment.AbstractPersistenceUnitRegistry.loadPersistenceDescriptor(AbstractPersistenceUnitRegistry.java:263)
at weblogic.deployment.ModulePersistenceUnitRegistry.(ModulePersistenceUnitRegistry.java:69)
at weblogic.ejb.container.deployer.EJBModule.setupPersistenceUnitRegistry(EJBModule.java:223)
at weblogic.ejb.container.deployer.EJBModule$1.execute(EJBModule.java:324)
at weblogic.deployment.PersistenceUnitRegistryInitializer.setupPersistenceUnitRegistries(PersistenceUnitRegistryInitializer.java:62)
at weblogic.ejb.container.deployer.EJBModule.prepare(EJBModule.java:393)

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