intersense addTracker

[krimble]

Mainly I can't use the addTracker function.

#Add a tracker.
isense = viz.add('intersense.dle')
tracker = isense.addTracker()

#Link the tracker to the view.
viz.link( tracker, view )

Error Message:
intersense.dle Intersense Extension
InterSense is connected on port 1
** Load Time: 1.64 seconds
** ERROR: Failed to connect to Intersense tracker on port 1
** ERROR: Failed to create extension sensor with intersense.dle

Do I need to use a more uptodate plugin? What is wrong?

Thank you!!