java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at oracle.iam.oimupgrade.mdstransferlisteners.util.CommonUtil.readmetadataMergeClassMap(CommonUtil.java:369)
at oracle.iam.oimupgrade.mdstransferlisteners.util.ListenerUtil.postOperation(ListenerUtil.java:148)
at oracle.iam.oimupgrade.mdstransferlisteners.EntityTranferListener.postOperation(EntityTranferListener.java:70)
at oracle.mds.internal.transfer.InternalMDSTransfer$1.run(InternalMDSTransfer.java:2183)
at oracle.mds.internal.transfer.InternalMDSTransfer.postOperation(InternalMDSTransfer.java:2179)
at oracle.mds.internal.transfer.InternalMDSTransfer.execute(InternalMDSTransfer.java:1888)
at oracle.mds.internal.transfer.InternalMDSTransfer.transfer(InternalMDSTransfer.java:471)
at oracle.mds.internal.lcm.deploy.DeployManager.doTransfer(DeployManager.java:1574)
at oracle.mds.internal.lcm.deploy.DeployManager.invokeTransfer(DeployManager.java:1455)
at oracle.mds.internal.lcm.deploy.DeployManager.deployToDBRepository(DeployManager.java:1232)
at oracle.mds.internal.lcm.deploy.DeployManager.deploySingleMAR(DeployManager.java:897)
at oracle.mds.internal.lcm.deploy.DeployManager.deploy(DeployManager.java:713)
at oracle.mds.internal.lcm.deploy.DeployManager.startDeployment(DeployManager.java:204)
at oracle.mds.internal.lcm.MDSLifecycleListenerImpl.start(MDSLifecycleListenerImpl.java:215)
at oracle.mds.lcm.weblogic.WLLifecycleListener.preStart(WLLifecycleListener.java:77)
at weblogic.application.internal.flow.BaseLifecycleFlow$PreStartAction.run(BaseLifecycleFlow.java:282)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.application.internal.flow.BaseLifecycleFlow$LifecycleListenerAction.invoke(BaseLifecycleFlow.java:199)
at weblogic.application.internal.flow.BaseLifecycleFlow.preStart(BaseLifecycleFlow.java:62)
at weblogic.application.internal.flow.HeadLifecycleFlow.prepare(HeadLifecycleFlow.java:283)
at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.java:613)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)
at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:184)
at weblogic.application.internal.EarDeployment.prepare(EarDeployment.java:58)
at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:154)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:60)
at weblogic.deploy.internal.targetserver.AppDeployment.prepare(AppDeployment.java:141)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doPrepare(DeploymentAdapter.java:39)
at weblogic.management.deploy.internal.DeploymentAdapter.prepare(DeploymentAdapter.java:191)
at weblogic.management.deploy.internal.AppTransition$1.transitionApp(AppTransition.java:21)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:261)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:220)
at weblogic.management.deploy.internal.ConfiguredDeployments.prepare(ConfiguredDeployments.java:165)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:122)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:180)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:96)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:528)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)

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