HuskyLensLibrary IndexError

I'm trying to use the HuskyLensLibrary.  My code right now looks like this:

import time
from huskylib import *

hl = HuskyLensLibrary("SERIAL", "/dev/ttyUSB1")
hl.algorithm("ALGORITHM_OBJECT_TRACKING")
time.sleep(1)

while True:
hl.requestAll()
blocks = hl.blocks()

if blocks:
rint("object detected")
else:
print("No object detected.")

time.sleep(0.5)

What it's supposed to do is take a picture whenever it sees an object.  When I run the code, I get an INDEXERROR.  See attached picture.  

Is there better or more up to date documentation or library on running the HuskyLens with the raspberryPi?  The github library seems old and not well maintained.  

What am I doing wrong?