Image Occlusion Enhanced doesn't work Win8 Anki 2.1.49

Just added the Image Occlusion Enhanced Add on, and this is what appears when i try to use it
Informazioni di debug:
Anki 2.1.49 (dc80804a) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 8.1
Flags: frz=True ao=True sv=2
Add-ons, last update check: 2022-10-06 17:08:09

Caught exception:
Traceback (most recent call last):
File “anki\”, line 42, in get_immutable
File “anki_backend\”, line 519, in get_config_json
File “”, line 131, in _run_command

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File “aqt\”, line 41, in cmd
File “aqt\”, line 142, in _onCmd
File “aqt\”, line 595, in _onBridgeCmd
File “aqt\”, line 438, in onBridgeCmd
File “C:\Users\francesco\AppData\Roaming\Anki2\addons21\1374772155\”, line 101, in
lambda o=editor: onImgOccButton(o),
File “C:\Users\francesco\AppData\Roaming\Anki2\addons21\1374772155\”, line 61, in onImgOccButton
io_model = getOrCreateModel()
File “C:\Users\francesco\AppData\Roaming\Anki2\addons21\1374772155\”, line 121, in getOrCreateModel
model_version = mw.col.conf[‘imgocc’][‘version’]
File “anki\”, line 61, in getitem
File “anki\”, line 44, in get_immutable