Mixamo add on- creating control rig throws error

Hi, I've tried this with several rigged character models that I downloaded from the mixamo website. When I try to "create control rig" with the mixamo add on, I get this same error every time: 

Report: Error
Python: Traceback (most recent call last):
File "/Users/rtongbai/Library/Application Support/Blender/4.0/scripts/addons/mixamo_rig/mixamo_rig.py", line 157, in execute
layer_select = enable_all_armature_layers()
File "/Users/rtongbai/Library/Application Support/Blender/4.0/scripts/addons/mixamo_rig/lib/armature.py", line 12, in enable_all_armature_layers _layers = bpy.context.active_object.data.layers
AttributeError: 'Armature' object has no attribute 'layers'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Users/rtongbai/Library/Application Support/Blender/4.0/scripts/addons/mixamo_rig/mixamo_rig.py", line 202, in execute
restore_armature_layers (layer_select)
File "/Users/rtongbai/Library/Application
Support/Blender/4.0/scripts/addons/mixamo_rig/lib/armature.py", line 6, in restore_armature_layers
bpy.context.active_object.data.layers[i] = layers_select[i]
IndexError: list index out of range

Any suggestions? Thanks in advance guys!