# File lib/ruote/dashboard.rb, line 1118
    def on_error=(target)

      @context.tracker.add_tracker(
        nil, # do not track a specific wfid
        'error_intercepted', # react on 'error_intercepted' msgs
        'on_error', # the identifier
        nil, # no specific condition
        { 'action' => 'launch',
          'wfid' => 'replace',
          'tree' => target.is_a?(String) ?
            [ 'define', {}, [ [ target, {}, [] ] ] ] : target,
          'workitem' => 'replace',
          'variables' => 'compile' })
    end