Only one deck not opening

For some reason every time I try to click on a specific deck, an error message pops up about the add-ons. I’ve followed the instructions and temporarily disabled/deleted all the add-ons one at a time but the error message keeps popping up:

Error
An error occurred. Please start Anki while holding down the shift key, which will temporarily disable the add-ons you have installed.
If the issue only occurs when add-ons are enabled, please use the Tools > Add-ons menu item to disable some add-ons and restart Anki, repeating until you discover the add-on that is causing the problem.
When you’ve discovered the add-on that is causing the problem, please report the issue on the add-on support site.
Debug info:
Anki 2.1.44 (b2b3275f) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 10
Flags: frz=True ao=True sv=2
Add-ons, last update check: 2021-09-03 13:25:43

Caught exception:
Traceback (most recent call last):
File “aqt\webview.py”, line 36, in cmd
File “aqt\webview.py”, line 135, in _onCmd
File “aqt\webview.py”, line 580, in _onBridgeCmd
File “”, line 2, in _linkHandler
File “anki\hooks.py”, line 89, in decorator_wrapper
File “anki\hooks.py”, line 86, in repl
File “C:\Users\chris\AppData\Roaming\Anki2\addons21\723520343\links.py”, line 74, in heatmapLinkHandler
return None if not _old else _old(self, url)
File “aqt\overview.py”, line 65, in _linkHandler
File “aqt\main.py”, line 653, in moveToState
File “aqt\main.py”, line 675, in _reviewState
File “aqt\reviewer.py”, line 73, in show
File “aqt\reviewer.py”, line 124, in nextCard
File “aqt\reviewer.py”, line 187, in showQuestion
File “anki\cards.py”, line 113, in question
File “anki\cards.py”, line 133, in render_output
File “anki\template.py”, line 117, in from_existing_card
File “anki\cards.py”, line 144, in note
File “anki\collection.py”, line 326, in getNote
File “anki\notes.py”, line 36, in init
File “anki\notes.py”, line 42, in load
File “anki_backend\generated.py”, line 436, in get_note
File "anki_backend_init
.py", line 106, in _run_command
anki.errors.NotFoundError

This error message doesn’t show up for any other deck, just for one. How can I fix the error without losing all the content in that deck?

The culprit seems to be ReviewHeatmap - AnkiWeb which apparently is a fake add-on (Check the comments on the web page).

Disabling the add-on should work. Make sure you restart Anki after doing that for the changes to take effect.

1 Like

I deleted the add-on but am still getting same error message:

Error
An error occurred. Please start Anki while holding down the shift key, which will temporarily disable the add-ons you have installed.
If the issue only occurs when add-ons are enabled, please use the Tools > Add-ons menu item to disable some add-ons and restart Anki, repeating until you discover the add-on that is causing the problem.
When you’ve discovered the add-on that is causing the problem, please report the issue on the add-on support site.
Debug info:
Anki 2.1.44 (b2b3275f) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 10
Flags: frz=True ao=True sv=2
Add-ons, last update check: 2021-09-03 13:25:43

Caught exception:
Traceback (most recent call last):
File “aqt\webview.py”, line 36, in cmd
File “aqt\webview.py”, line 135, in _onCmd
File “aqt\webview.py”, line 580, in _onBridgeCmd
File “aqt\overview.py”, line 65, in _linkHandler
File “aqt\main.py”, line 653, in moveToState
File “aqt\main.py”, line 675, in _reviewState
File “aqt\reviewer.py”, line 73, in show
File “aqt\reviewer.py”, line 124, in nextCard
File “aqt\reviewer.py”, line 187, in showQuestion
File “anki\cards.py”, line 113, in question
File “anki\cards.py”, line 133, in render_output
File “anki\template.py”, line 117, in from_existing_card
File “anki\cards.py”, line 144, in note
File “anki\collection.py”, line 326, in getNote
File “anki\notes.py”, line 36, in init
File “anki\notes.py”, line 42, in load
File “anki_backend\generated.py”, line 436, in get_note
File "anki_backend_init
.py", line 106, in _run_command
anki.errors.NotFoundError

Well, at least the part relating to the add-on went away. You could try to start Anki holding down Shift, in case you haven’t already. Apart from that, I’m afraid I can’t help you out any further.

If you’re still having trouble, please follow the steps on the following page and let us know how you go:

When problems occur - Frequently Asked Questions