Handle error in Waiting element

ThongNguyen — Mon, 28 Aug 2017 07:26:16 -0400
When i use waiting element of Ivy. In case I call this two time with an eventID. I get a log error and log warning. So I try to use error element to catch this error to show on UI. But impossible. How can i do it?
    11:31:25.254 ERROR [ch.ivyteam.ivy.system.task.internal] [ivy immediate job pool-thread-19] [executionContext=SYSTEM] 
  Could not process system user task 182,898. The system will try to execute the system user task again after a timeout.
    java.lang.IllegalStateException: An intermediate event for task #182880 with the identical event identifier 'SMART_METER_GAETWAY_METER_CREATE_CONFIRMATION_EVENT_ID_005056b0-f842-1ed7-8daa-75acae8f09b2' already exists. The event identifier of an intermediate event element must always be unique!
        at ch.ivyteam.ivy.workflow.internal.Case.createIntermediateEvent(Case.java:2214)
        at ch.ivyteam.ivy.workflow.internal.Case.createNewTask(Case.java:2150)
        at ch.ivyteam.ivy.workflow.internal.Case.endJoiningTasksAndStartNewTasks(Case.java:1970)
        at ch.ivyteam.ivy.workflow.internal.Case$50.execute(Case.java:1913)
        at ch.ivyteam.ivy.workflow.internal.Case$50.execute(Case.java:1)
        at ch.ivyteam.ivy.persistence.base.AbstractPersistencyService.execute(AbstractPersistencyService.java:169)
        at ch.ivyteam.ivy.persistence.base.AbstractPersistencyService.execute(AbstractPersistencyService.java:226)
        at ch.ivyteam.ivy.persistence.base.ClassPersistencyService.execute(ClassPersistencyService.java:660)
        at ch.ivyteam.ivy.persistence.client.PersistentClientObjectInternal.execute(PersistentClientObjectInternal.java:155)
        at ch.ivyteam.ivy.persistence.client.PersistentClientObject.execute(PersistentClientObject.java:1)
        at ch.ivyteam.ivy.workflow.internal.Case.execute(Case.java:1)
        at ch.ivyteam.ivy.workflow.internal.Case.endJoiningTasksAndStartNewTasks(Case.java:1907)
        at ch.ivyteam.ivy.workflow.internal.WorkflowSession.endJoiningTasksAndStartNewTasks_aroundBody38(WorkflowSession.java:1137)
        at ch.ivyteam.ivy.workflow.internal.WorkflowSession.endJoiningTasksAndStartNewTasks_aroundBody39$advice(WorkflowSession.java:34)
        at ch.ivyteam.ivy.workflow.internal.WorkflowSession.endJoiningTasksAndStartNewTasks(WorkflowSession.java:1)
        at ch.ivyteam.ivy.bpm.exec.restricted.task.TaskSwitchEndJoiner.endJoiningTaskAndStartNewTask(TaskSwitchEndJoiner.java:39)
        at ch.ivyteam.ivy.bpm.exec.restricted.task.TaskSwitchEndRequestExecutor.endJoiningAndSetAutoTaskResumedWhenItExists(TaskSwitchEndRequestExecutor.java:83)
        at ch.ivyteam.ivy.bpm.exec.restricted.task.TaskSwitchEndRequestExecutor.execute(TaskSwitchEndRequestExecutor.java:60)
        at ch.ivyteam.ivy.bpm.engine.internal.core.RequestProcessor.executeRequestEndExecutor(RequestProcessor.java:186)
        at ch.ivyteam.ivy.bpm.engine.internal.core.RequestProcessor.handleRequest(RequestProcessor.java:79)
        at ch.ivyteam.ivy.bpm.engine.internal.BpmEngine.handleNormalRequest(BpmEngine.java:189)
        at ch.ivyteam.ivy.bpm.engine.internal.BpmEngine.handleRequestWithinContext(BpmEngine.java:138)
        at ch.ivyteam.ivy.request.impl.ContextAwareRequestHandler.handleRequest(ContextAwareRequestHandler.java:32)
        at ch.ivyteam.ivy.system.task.internal.SystemTaskJob.executeProcess(SystemTaskJob.java:166)
        at ch.ivyteam.ivy.system.task.internal.SystemTaskJob.executeInternal(SystemTaskJob.java:98)
        at ch.ivyteam.ivy.system.task.internal.SystemTaskJob$1.call(SystemTaskJob.java:67)
        at ch.ivyteam.ivy.security.internal.SecurityManager.executeAsSystem(SecurityManager.java:1440)
        at ch.ivyteam.ivy.system.task.internal.SystemTaskJob.execute(SystemTaskJob.java:62)
        at ch.ivyteam.ivy.job.internal.JobManager$1.call(JobManager.java:267)
        at ch.ivyteam.ivy.job.internal.JobManager$1.call(JobManager.java:1)
        at ch.ivyteam.util.callable.ExecutionContextContainer$ContainerExecutionContext.call(ExecutionContextContainer.java:92)
        at ch.ivyteam.ivy.security.internal.SecurityManager.executeInContext_aroundBody0(SecurityManager.java:1492)
        at ch.ivyteam.ivy.security.internal.SecurityManager.executeInContext_aroundBody1$advice(SecurityManager.java:41)
        at ch.ivyteam.ivy.security.internal.SecurityManager.executeInContext(SecurityManager.java:1)
        at ch.ivyteam.util.callable.ExecutionContextContainer$ContainerExecutionContext.call(ExecutionContextContainer.java:88)
        at ch.ivyteam.util.callable.ExecutionContextContainer.executeInContext(ExecutionContextContainer.java:27)
        at ch.ivyteam.ivy.job.internal.JobManager.execute(JobManager.java:261)
        at ch.ivyteam.ivy.job.internal.Job.run(Job.java:83)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

    11:31:25.264 WARN [ch.ivyteam.ivy.server.persistency.db] [ivy immediate job pool-thread-19] [executionContext=SYSTEM] 
  String An intermediate event for task #182880 with the identical event identifier 'SMART_METER_GAETWAY_METER_CREATE_CONFIRMATION_EVENT_ID_005056b0-f842-1ed7-8daa-75acae8f09b2' already exists. The event identifier of an intermediate event element must always be unique! trunkated because it is to long to store in database column which only supports 200 characters
Questions asked by ThongNguyen

Handle error in Waiting element
