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

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This exception has no message.
java.lang.NullPointerException:
at weblogic.application.internal.AppClassLoaderManagerImpl.removeApplicationLoader(AppClassLoaderManagerImpl.java:58)
at weblogic.application.internal.flow.EarClassLoaderFlow.unprepare(EarClassLoaderFlow.java:69)
at weblogic.application.internal.BaseDeployment$1.previous(BaseDeployment.java:621)
at weblogic.application.utils.StateMachineDriver.previousState(StateMachineDriver.java:148)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:40)
at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:191)
at weblogic.application.internal.EarDeployment.prepare(EarDeployment.java:16)
at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:155)
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:187)
at weblogic.management.deploy.internal.AppTransition$1.transitionApp(AppTransition.java:21)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:233)
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:173)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:89)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

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