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

java.lang.NullPointerException: 	at oracle.security.am.common.utilities.crypto.OAMKeyStore.getKeyStore(OAMKeyStore.java:193)	at oracle.security.am.common.utilities.crypto.OAMKeyStore.(OAMKeyStore.java:120)	at oracle.security.am.common.utilities.crypto.OAMKeyStore.getInstance(OAMKeyStore.java:138)	at oracle.security.am.engines.sso.adapter.OAMSessionConfiguration$ConfigListener.configurationChanged(OAMSessionConfiguration.java:145)	at oracle.security.am.engines.sso.adapter.OAMSessionConfiguration.registerConfigChangeListener(OAMSessionConfiguration.java:73)	at oracle.security.am.engines.sso.adapter.OAMSessionConfiguration.(OAMSessionConfiguration.java:67)	at oracle.security.am.engines.sso.adapter.OAMSessionConfiguration.(OAMSessionConfiguration.java:57)	at oracle.security.am.engines.sso.adapter.AbstractSessionAdapterImpl.checkAndInit(AbstractSessionAdapterImpl.java:92)	at oracle.security.am.engines.sso.adapter.AbstractSessionAdapterImpl.(AbstractSessionAdapterImpl.java:75)	at oracle.security.am.engines.sso.adapter.MultipleUserSessionAdapterImpl.(MultipleUserSessionAdapterImpl.java:56)	at oracle.security.am.engines.sso.adapter.MultipleUserSessionAdapterImpl.(MultipleUserSessionAdapterImpl.java:45)	at oracle.security.am.engines.sso.adapter.SessionManagementAdapterFactory.getAdapter(SessionManagementAdapterFactory.java:46)	at oracle.security.am.engines.enginecontroller.SSOEngineController.processEvent(SSOEngineController.java:497)	at oracle.security.am.controller.MasterController.processEvent(MasterController.java:568)	at oracle.security.am.controller.MasterController.processRequest(MasterController.java:757)	at oracle.security.am.controller.MasterController.process(MasterController.java:680)	at oracle.security.am.pbl.transport.http.AMInitServlet.initializeAmServer(AMInitServlet.java:137)	at oracle.security.am.pbl.transport.http.AMInitServlet.init(AMInitServlet.java:79)	at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:283)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)	at weblogic.servlet.internal.StubSecurityHelper.createServlet(StubSecurityHelper.java:64)	at weblogic.servlet.internal.StubLifecycleHelper.createOneInstance(StubLifecycleHelper.java:58)	at weblogic.servlet.internal.StubLifecycleHelper.(StubLifecycleHelper.java:48)	at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:539)	at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:1984)	at weblogic.servlet.internal.WebAppServletContext.loadServletsOnStartup(WebAppServletContext.java:1958)	at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1877)	at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:3173)	at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1527)	at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:486)	at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425)	at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)	at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119)	at weblogic.application.internal.flow.ScopedModuleDriver.start(ScopedModuleDriver.java:200)	at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:247)	at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425)	at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)	at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119)	at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:27)	at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:671)	at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)	at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:212)	at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:59)	at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161)	at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:80)	at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:573)	at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:150)	at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:116)	at weblogic.deploy.internal.targetserver.operations.StartOperation.doCommit(StartOperation.java:149)	at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:327)	at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:844)	at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1253)	at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:440)	at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:163)	at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:195)	at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:13)	at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:68)	at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:545)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)