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java.lang.NullPointerException: 	at oracle.bpel.services.workflow.task.impl.WorkflowUtil.createAndStoreWorkflowError(WorkflowUtil.java:3348)	at oracle.bpel.services.workflow.task.impl.TaskRulesService.executeRulesInternal(TaskRulesService.java:397)	at oracle.bpel.services.workflow.task.impl.TaskRulesService.executeRules(TaskRulesService.java:164)	at oracle.bpel.services.workflow.task.impl.TaskService.performPostActionOperationInTrans(TaskService.java:5856)	at oracle.bpel.services.workflow.task.impl.TaskService.performPostActionOperation(TaskService.java:5572)	at oracle.bpel.services.workflow.task.impl.TaskService.performPostActionOperation(TaskService.java:5543)	at oracle.bpel.services.workflow.task.impl.TaskService.performPostActionOperation(TaskService.java:5525)	at oracle.bpel.services.workflow.task.impl.TaskService.releaseTask(TaskService.java:4325)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:296)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:177)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)	at oracle.bpel.services.workflow.common.WorkflowServiceCacheEventAdvice.invoke(WorkflowServiceCacheEventAdvice.java:89)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)	at oracle.bpel.services.workflow.test.workflow.ExceptionTestCaseBuilder.invoke(ExceptionTestCaseBuilder.java:155)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)	at oracle.bpel.services.common.dms.MethodEventAspect.invoke(MethodEventAspect.java:70)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)	at oracle.bpel.services.common.dms.MethodPhaseEventAspect.invoke(MethodPhaseEventAspect.java:82)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy181.releaseTask(Unknown Source)	at oracle.bpel.services.workflow.task.ejb.tasktimer.TaskTimerBean.releaseTask(TaskTimerBean.java:90)	at oracle.bpel.services.workflow.task.ejb.tasktimer.TaskTimerBean_3udxq8EOImpl.releaseTask(TaskTimerBean3udxq8_EOImpl.java:63)	at oracle.bpel.services.workflow.task.impl.WorkflowTimerAgent$AutoReleaseJob.execute(WorkflowTimerAgent.java:710)	at oracle.integration.platform.blocks.scheduler.ScheduledJob.execute(ScheduledJob.java:184)	at org.quartz.core.JobRunShell.run(JobRunShell.java:202)	at oracle.integration.platform.blocks.executor.WorkManagerExecutor$1.run(WorkManagerExecutor.java:77)	at weblogic.work.j2ee.J2EEWorkManager$WorkWithListener.run(J2EEWorkManager.java:183)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)