JBPM 6 BPM Design : how to define error reference and dataoutputassociation ? How to get expection object from Service task ?

[crasybpm]

Hello ,

       I am  using JBPM 6 BPM Desinger . I have one service task which throws RuntimeException and catching  using Error Event.

       I am able to catch event as but i am getting Event object as null. I need to display this error on user task.     

       Attached is screenshot of process and work item handler .

Regards,

Crasybpm