str has no attribute decode

[tutr464b]

Hi, I am facing a problem. I am using Python 3
When I run the code, this error shows up: AttributeError: 'str' object has no attribute 'decode'
I googled it and it seems here we don't need the decode more. I then deleted it, but then a new error showed up:
Traceback (most recent call last):
File "/home/tuan/Documents/catkin_ws/src/vive_tracker/scripts/vive_tracker.py", line 151, in
vive_tracker()
File "/home/tuan/Documents/catkin_ws/src/vive_tracker/scripts/vive_tracker.py", line 39, in vive_tracker
v.print_discovered_objects()
File "/home/tuan/Documents/catkin_ws/src/vive_tracker/scripts/triad_openvr.py", line 259, in print_discovered_objects
self.devices[device].get_model()
File "/home/tuan/Documents/catkin_ws/src/vive_tracker/scripts/triad_openvr.py", line 163, in get_model
print(self.vr.getStringTrackedDeviceProperty(self.index,openvr.Prop_ModelNumber_String))
File "/usr/local/lib/python3.8/dist-packages/openvr/init.py", line 3213, in getStringTrackedDeviceProperty
openvr.error_code.TrackedPropertyError.check_error_value(error.value)
File "/usr/local/lib/python3.8/dist-packages/openvr/error_code/init.py", line 23, in check_error_value
raise error_class(error_value, message)
openvr.error_code.TrackedProp_UnknownProperty

How do I fix it?
Thanks it advance