Error on selection of cylinders.txt file

[Bazmundi]

running python 3.8.1
using command line:

python logfile_viewer.py

Both logfile_viewer.py and lego_robot.py from your UNIT A code.

Traceback (most recent call last):
File "logfile_viewer.py", line 297, in
add_file()
File "logfile_viewer.py", line 197, in add_file
load_data()
File "logfile_viewer.py", line 254, in load_data
if logfile.world_cylinders:
AttributeError: 'LegoLogfile' object has no attribute 'world_cylinders'

Example from my cylinders.txt:

D C 364.0 -289.1 1416.8 -466.9 1747.1 244.1 1132.1 562.2 540.3 589.7 900.9 1315.2
D C 365.2 -290.0 1417.5 -467.1 1744.4 243.7 1131.6 562.0 542.7 592.4 901.6 1316.3
D C 365.2 -290.0 1419.5 -467.8 1745.1 243.8 1133.2 562.8 543.4 593.1 903.8 1319.4
D C 365.4 -290.2 1418.1 -467.3 1741.3 243.3 1131.7 562.0 542.5 592.1 901.4 1315.9
D C 364.2 -289.2 1420.2 -468.0 1742.7 243.5 1131.0 561.7 539.0 588.3 902.3 1317.2
D C 364.3 -289.3 1414.9 -466.2 1744.5 243.7 1132.2 562.3 539.8 589.2 901.1 1315.5
D C 363.8 -288.9 1418.9 -467.5 1739.0 242.9 1134.8 563.6 541.5 591.0 901.6 1316.2
D C 364.1 -289.1 1418.2 -467.3 1741.2 243.3 1134.5 563.4 542.7 592.3 901.6 1316.3
D C 364.3 -289.3 1417.1 -467.0 1743.4 243.6 1132.5 566.8 541.6 591.1 902.1 1317.0
D C 364.9 -289.8 1416.9 -462.1 1742.4 243.4 1132.3 562.3 541.3 590.8 901.6 1316.3
D C 363.3 -288.5 1419.0 -467.6 1743.0 243.5 1134.9 563.6 541.5 591.1 902.8 1318.1
D C 363.9 -289.0 1417.4 -467.1 1747.6 244.1 1134.5 563.4 540.7 590.2 901.4 1316.0
D C 364.2 -289.2 1423.0 -468.9 1744.6 243.7 1132.8 562.6 541.0 594.1 901.8 1316.5
D C 364.5 -289.4 1416.2 -466.7 1744.4 243.7 1131.2 566.1 541.3 590.8 901.3 1315.8
D C 352.8 -289.1 1402.4 -462.1 1718.8 245.5 1077.0 547.3 520.3 592.9 883.3 1324.1
D C 313.5 -289.0 1363.9 -468.1 1690.1 236.1 1051.9 546.8 490.8 591.5 852.0 1320.7

FIX
Add the following to:

class LegoLogfile(object):
    def __init__(self):
       self.world_cylinders = []