taskInstance.id in workflow js

[akudinov]

I try to use javascript in transition action:

<action class="org.alfresco.repo.workflow.jbpm.AlfrescoJavaScript">
        <script>
             log.debug( "task_id:" + taskInstance.id)
        </script>
…
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but I have exception, when I execute this step in workflow. In log I can't  see any exceptions

Where is my problem ?