Image Occlusion Enhanced for Anki 21 alpha⁩

Image Occlusion Enhanced for Anki 21 alpha⁩ is not working and giving me this error message

Debug info:
Anki 2.1.49 (dc80804a) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Mac 10.16
Flags: frz=True ao=True sv=2
Add-ons, last update check: 2022-08-08 10:49:28
Add-ons possibly involved: ⁨Image Occlusion Enhanced for Anki 21 alpha⁩

Caught exception:
Traceback (most recent call last):
File “aqt/webview.py”, line 541, in handler
File “/Users/taylorgeddes/Library/Application Support/Anki2/addons21/1374772155/add.py”, line 278, in
lambda val, choice=choice, close=close: self._onAddNotesButton(choice, close, val))
File “/Users/taylorgeddes/Library/Application Support/Anki2/addons21/1374772155/add.py”, line 293, in _onAddNotesButton
r = gen.generateNotes()
File “/Users/taylorgeddes/Library/Application Support/Anki2/addons21/1374772155/ngen.py”, line 80, in generateNotes
(svg_node, layer_node) = self._getMnodesAndSetIds()
File “/Users/taylorgeddes/Library/Application Support/Anki2/addons21/1374772155/ngen.py”, line 190, in _getMnodesAndSetIds
mask_doc = minidom.parseString(self.new_svg.encode(‘utf-8’))
AttributeError: ‘NoneType’ object has no attribute ‘encode’