Crashing when I select Tracker option

[GoldenSun]

Here is the entire script. Thanks for your help.

import viz
import math
#import vizmat
import vizinfo

global data 
global tracking_data

viz.go(viz.PROMPT)
viz.collision(viz.ON) 
viz.clearcolor

# Constants
ROTATION_INC		= 2
TRANSLATE_INC		= 0.1

#TIMERS
ANIMATE             = 0
TRACK				= 1
TRACKJOY			= 2

#in seconds
ANIMATE_RATE        = 0.01
TRACK_RATE			= 0.5


ground = viz.add('tut_ground.wrl')

walltexture = viz.addTexture( 'brick.jpg' )
#walltexture1 = viz.addTexture( 'woodfloor2.jpg' )
#walltexture2 = viz.addTexture( 'ToolBar.jpg' )

#ceiling = viz.add('box.wrl')
#ceiling.translate(-2.200, 3.0, -2.3)
#ceiling.setScale(4.600, 0.1, 5.500)
#ceiling.color(viz.WHITE)

southwall = viz.add('box.wrl')
southwall.appearance(viz.DECAL)
southwall.translate(-2.000, 1.500, +0.450)
southwall.setScale(4.600, 3.000, 0.100)
southwall.texture( walltexture ) 

eastwall = southwall.clone()
eastwall.setPosition(-4.300, 1.500, -2.300 )
eastwall.setScale(0.100, 3.000, 5.500)

northwall = southwall.clone()
northwall.setPosition(-2.430, 1.500, -5.050 )
northwall.setScale(3.658, 3.000, 0.100 )

westwall = southwall.clone()
westwall.setPosition(0.300, 1.500, -2.279  )
westwall.setScale(0.100, 3.000, 3.658 )

nw1 = southwall.clone()
nw1.setPosition(-0.150, 1.500, -4.110   )
nw1.setScale(0.900, 3.000, 0.100  )

nw2 = southwall.clone()
nw2.setPosition(-0.600, 1.500, -4.558  )
nw2.setScale(0.100,3.000, 0.900  )
 
h1 = southwall.clone()
h1.setPosition(-2.429, 1.500, -4.110 )
h1.setScale(1.829, 3.00, 0.100 )

h2 = southwall.clone()
h2.setPosition(-1.529, 1.500, -3.208 )
h2.setScale(1.829, 3.000, 0.100  )

h3 = southwall.clone()
h3.setPosition(-3.358, 1.500, -2.278  )
h3.setScale(1.829, 3.000, 0.100  )
 
h4 = southwall.clone()
h4.setPosition(-1.978, 1.500, -1.350   )
h4.setScale(0.900, 3.000, 0.100 )

h5 = southwall.clone()
h5.setPosition(-0.600, 1.500, -0.450  )
h5.setScale(1.829, 3.000, 0.100  )

v1 = southwall.clone()
v1.setPosition(-1.529, 1.500, -3.658   )
v1.setScale(0.100, 3.000, 0.915 )
 
v2 = southwall.clone()
v2.setPosition(-3.358, 1.500, -3.658 )
v2.setScale(0.100, 3.000, 0.900 )

v3 = southwall.clone()
v3.setPosition(-0.570, 1.500, -2.278  )
v3.setScale(0.100, 3.000, 1.829  )

v4 = southwall.clone()
v4.setPosition(-1.529, 1.500, -1.829  )
v4.setScale(0.100, 3.000, 0.900 )

v5 = southwall.clone()
v5.setPosition(-3.358, 1.500, -1.350   )
v5.setScale(0.100, 3.000, 1.829  )

v6 = southwall.clone()
v6.setPosition(-2.429, 1.500, -0.450   )
v6.setScale(0.100, 3.000, 1.829  )

avatar = viz.add('vcc_male.cfg', pos=(-3.800, 0, -2.2), euler=(0,0,0) )
avatar.setScale(0.800, 0.800, 0.300  )
avatar.state(4)

textT = viz.add(viz.TEXT3D, str("T"))
textT.setScale(0.3,0.3,0.3)
textT.translate(-3.800, 1.2, -2.1)
textT.setEuler(180, 0, 0.0)

#aduck = viz.add('duck.wrl')
#aduck.setPosition(-3.800, 1.000, -2.2   )
#aduck.setScale(0.500, 0.500, 0.500  )
#aduck.setEuler(90, 0.0, 0.0) 

screene = viz.add(viz.TEXQUAD)
screene.translate(-4.24, 1.500, -4.59)
screene.setEuler(-90, 0.0, 0.0) 
screene.scale(0.6, 0.5, 0.5)

imagene = viz.addTexture( 'maze1\woodenWell.jpg' )
screene.texture(imagene)

screenn = viz.add(viz.TEXQUAD)
screenn.translate(-3.8, 1.500, -4.99)
screenn.scale(0.5, 0.5, 0.5)
screenn.setEuler(180, 0.0, 0.0) 
imagenn = viz.addTexture( 'maze1\clock.jpg' )
screenn.texture(imagenn)

screenw = viz.add(viz.TEXQUAD)
screenw.translate(0.24, 1.500, -3.7)
screenw.setEuler(90, 0.0, 0.0) 
screenw.scale(0.5, 0.5, 0.5)

imagew = viz.addTexture( 'maze1\CandlePlate.jpg' )
screenw.texture(imagew)

screenw1 = viz.add(viz.TEXQUAD)
screenw1.translate(0, 1.500, -4.05)
screenw1.scale(0.3, 0.5, 0.5)
screenw1.setEuler(180, 0.0, 0.0) 

imagenw1 = viz.addTexture( 'maze1\OrangeChair.jpg' )
screenw1.texture(imagenw1)


screenh2 = viz.add(viz.TEXQUAD)
screenh2.translate(-0.85, 1.500, -3.15)
screenh2.scale(0.3, 0.5, 0.5)

imageh2 = viz.addTexture( 'maze1\plant1.jpg' )
screenh2.texture(imageh2)

screenh4 = viz.add(viz.TEXQUAD)
screenh4.translate(-1.97, 1.500, -1.42)
screenh4.scale(0.5, 0.4, 0.5)

imageh4 = viz.addTexture( 'maze1\curvydesk.jpg' )
screenh4.texture(imageh4)

screenv1 = viz.add(viz.TEXQUAD)
screenv1.translate(-1.58, 1.500, -3.658)
screenv1.setEuler(90, 0.0, 0.0) 
screenv1.scale(0.6, 0.5, 0.5)

imagev1 = viz.addTexture( 'maze1\RedWine.jpg' )
screenv1.texture(imagev1)

screenv3 = viz.add(viz.TEXQUAD)
screenv3.translate(-0.623, 1.500, -2.7)
screenv3.setEuler(90, 0.0, 0.0) 
screenv3.scale(0.6, 0.5, 0.5)

imagev3 = viz.addTexture( 'maze1\limens.jpg' )
screenv3.texture(imagev3)

screenv4 = viz.add(viz.TEXQUAD)
screenv4.translate(-1.59, 1.500, -1.8)
screenv4.setEuler(90, 0.0, 0.0) 
screenv4.scale(0.5, 0.4, 0.5)

imagev4 = viz.addTexture( 'maze1\Glasses.jpg' )
screenv4.texture(imagev4)

screenexit = viz.add(viz.TEXQUAD)
screenexit.translate(-2.36, 1.500, -0.45)
screenexit.setEuler(90, 0.0, 0.0) 
screenexit.scale(0.3, 0.5, 0.5)

imageexit = viz.addTexture( 'maze1\cnotes.jpg' )
screenexit.texture(imageexit)

text = viz.add(viz.TEXT3D, str("STOP"))
text.setScale(0.3,0.3,0.3)
text.translate(0.5, 1.5, .4)
text.setEuler(90, 0, 0.0)

text1 = viz.add(viz.TEXT3D, str("1"))
text1.setScale(0.3,0.3,0.3)
text1.translate(0.25, 1.5, -3.95)
text1.setEuler(135, 0, 0.0)

text2 = viz.add(viz.TEXT3D, str("2"))
text2.setScale(0.3,0.3,0.3)
text2.translate(-4.12, 1.5, -5.)
text2.setEuler(-135, 0, 0.0)

text3 = viz.add(viz.TEXT3D, str("3"))
text3.setScale(0.3,0.3,0.3)
text3.translate(-1.58, 1.03, -3.6)
text3.setEuler(90, 0, 0.0)

text4 = viz.add(viz.TEXT3D, str("4"))
text4.setScale(0.3,0.3,0.3)
text4.translate(-0.6, 1.5, -3.05)
text4.setEuler(135, 0, 0.0)

text5 = viz.add(viz.TEXT3D, str("5"))
text5.setScale(0.3,0.3,0.3)
text5.translate(-1.69, 1.5, -1.42)
text5.setEuler(45, 0, 0.0)

viz.translate(viz.HEAD_POS,0.5,0,0)
viz.MainView.setEuler(-90,20,0)

subject = viz.get(viz.INITMESG) #use it to enter subject number
#tracking_data = open('tracking_'+str(subject)+'.txt', 'w') #create a tracking data file
data = viz.get(viz.HEAD_POS)

if viz.get(viz.TRACKER):
	intersense = viz.add('intersense.dls')
	viz.tracker()  #?
	intersense.reset()  #reset intersense tracking data to 0 initial 
	viz.eyeheight(1.0)
	#viz.link(intersense,viz.MainView)
	tracking = 1
else:
	tracking = 0
	#viz.collision(viz.ON)

if viz.get(viz.OPTION1):
	import vizjoy
	#import viztracker
	joy = vizjoy.add()
	#tracker = viztracker.add()
	#viz.link(tracker,viz.MainView)
	if not joy.valid():
		joy = None
else:
	joy = None

# Callback function to handle expiration timers
def mytimer(num):
	
	if num == ANIMATE:
		
		if joy:
			#Use joystick to move and turn
			pos = joy.getPosition()
			
			x = pos[0]
			y = pos[1]
			if math.fabs(y) > 0.2:
				viz.move(0,0,-y*0.01)
			if math.fabs(x) > 0.2:
				viz.rotate(viz.BODY_ORI,x*1,0,0)
	
	if num == TRACK:
		#global data 
		data = intersense.getData()  # Access the raw data from the sensor
		#data = v.getPosition()
		tracking_data.write(str(viz.tick())+','+str(data)+'\n')
		#print data  # Print the array of data 
	if num == TRACKJOY:
		#global data 
		data = viz.get(viz.HEAD_POS)
		tracking_data.write(str(viz.tick())+','+str(data)+'\n')
		#print data  # Print the array of data 


def mykeyboard(key):
	
	if key == 'j':
		print "writing to file for joy"
		viz.starttimer(TRACKJOY,TRACK_RATE, viz.FOREVER)
		vizinfo.add('Joystick Tracking...')
	if key == 'i':
		print "writing to file for intersense"
		viz.starttimer(TRACK,TRACK_RATE, viz.FOREVER)
		vizinfo.add('Intersense Tracking...')
	if key == 'p':
		print viz.get(viz.HEAD_POS)

viz.callback(viz.KEYBOARD_EVENT, mykeyboard)
viz.callback(viz.TIMER_EVENT, mytimer)

if joy:
	viz.starttimer(ANIMATE,ANIMATE_RATE,viz.FOREVER)
	tracking_data = open('joytracking_'+ str(subject)+'.txt', 'w') #create a tracking data file
if tracking:
	tracking_data = open('is900tracking_'+ str(subject)+'.txt', 'w') #create a tracking data file