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Problem with Image Occlusion Enhanced for 2.1 alpha

can’t make image occlusion cards after drawing rectangle boxes

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Debug info:
Anki 2.1.37 (6d596c8f) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Mac 10.15.7
Flags: frz=True ao=True sv=2
Add-ons, last update check: 2021-03-26 21:49:29
Add-ons possibly involved: ⁨Image Occlusion Enhanced for Anki 21 alpha⁩

Caught exception:
Traceback (most recent call last):
File “aqt/”, line 515, in handler
File “/Users/kunalshah/Library/Application Support/Anki2/addons21/1374772155/”, line 278, in
lambda val, choice=choice, close=close: self._onAddNotesButton(choice, close, val))
File “/Users/kunalshah/Library/Application Support/Anki2/addons21/1374772155/”, line 293, in _onAddNotesButton
r = gen.generateNotes()
File “/Users/kunalshah/Library/Application Support/Anki2/addons21/1374772155/”, line 87, in generateNotes
omask_path = self._saveMask(self.new_svg, self.occl_id, “O”)
File “/Users/kunalshah/Library/Application Support/Anki2/addons21/1374772155/”, line 399, in _saveMask
mask_file = open(mask_path, ‘wb’)
OSError: [Errno 30] Read-only file system: ‘d71ac9e441094f78a2e5830e50e59cad-oa-O.svg’