How to get wand tracker?

[Samuli]

Hi,
I've tried to get wand tracker (and later on use its orientation information) using either of the following code snippets:

ppt=viz.add('ppt.dle')
wand = ppt.addWand()

or:

spacez=viz.add('zspace.dle')
wand=spacez.addWandTracker()

but neither works. From the latter I get the following error message:

** ERROR: Failed to initialize zSpace: Runtime Not Found
** ERROR: Failed to create extension sensor with zspace.dle
skydome.dlc

.
The first code snippet produces following error message:

trying serial 3
Wand: input buffer not flushed
(Make sure port name is valid and it has not been opened by another program)

What is the correct way to get wand tracker?