when you try to do ocr the error log says

ERROR - vision.visionHandler._getProvidersFromFileSystem (19:08:56.997) - MainThread (15564):
Error while importing vision enhancement provider module NVDAHighlighter
Traceback (most recent call last):
File "vision\visionHandler.pyc", line 58, in _getProvidersFromFileSystem
File "vision\visionHandler.pyc", line 36, in getProviderClass
File "importlib_init.pyc", line 127, in import_module
File "", line 1006, in _gcd_import
File "", line 983, in _find_and_load
File "", line 967, in _find_and_load_unlocked
File "", line 668, in _load_unlocked
File "", line 638, in _load_backward_compatible
File "visionEnhancementProviders\NVDAHighlighter.pyc", line 242, in
AttributeError: module 'gui' has no attribute 'AutoSettingsMixin'
ERROR - vision.visionHandler._getProvidersFromFileSystem (19:08:57.012) - MainThread (15564):
Error while importing vision enhancement provider module screenCurtain
Traceback (most recent call last):
File "vision\visionHandler.pyc", line 58, in _getProvidersFromFileSystem
File "vision\visionHandler.pyc", line 36, in getProviderClass
File "importlib_init.pyc", line 127, in import_module
File "", line 1006, in _gcd_import
File "", line 983, in _find_and_load
File "", line 967, in _find_and_load_unlocked
File "", line 668, in _load_unlocked
File "", line 638, in _load_backward_compatible
File "visionEnhancementProviders\screenCurtain.pyc", line 218, in
AttributeError: module 'gui' has no attribute 'AutoSettingsMixin'
ERROR - queueHandler.flushQueue (19:08:57.032) - MainThread (15564):
Error in func VisionHandler.postGuiInit
Traceback (most recent call last):
File "queueHandler.pyc", line 64, in flushQueue
File "vision\visionHandler.pyc", line 96, in postGuiInit
File "vision\visionHandler.pyc", line 119, in _updateAllProvidersList
File "vision\visionHandler.pyc", line 103, in _getBuiltInProviderIds
File "", line 983, in _find_and_load
File "", line 967, in _find_and_load_unlocked
File "", line 668, in _load_unlocked
File "", line 638, in _load_backward_compatible
File "visionEnhancementProviders\NVDAHighlighter.pyc", line 242, in
AttributeError: module 'gui' has no attribute 'AutoSettingsMixin'
ERROR - scriptHandler.executeScript (19:09:10.693) - MainThread (15564):
error executing script: <bound method GlobalCommands.script_recognizeWithUwpOcr of <globalCommands.GlobalCommands object at 0x042DEA10>> with gesture 'NVDA+r'
Traceback (most recent call last):
File "scriptHandler.pyc", line 295, in executeScript
File "globalCommands.pyc", line 4066, in script_recognizeWithUwpOcr
File "", line 983, in _find_and_load
File "", line 967, in _find_and_load_unlocked
File "", line 668, in _load_unlocked
File "", line 638, in _load_backward_compatible
File "visionEnhancementProviders\screenCurtain.pyc", line 218, in
AttributeError: module 'gui' has no attribute 'AutoSettingsMixin'
it worked fine before this alpha version

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Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?