Error in Deadliner: Deadline Countdown for Exams add-on

[Adanze168]

I couldn't see the deadlines I created on decks (PC) and then I got this 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 to the add-on author.
Debug info:
Anki 2.1.66 (70506aeb) Python 3.9.15 Qt 6.5.2 PyQt 6.5.2
Platform: Windows-10-10.0.22621
Flags: frz=True ao=True sv=3
Add-ons, last update check: 2023-10-19 14:14:04
Add-ons possibly involved: ⁨Deadliner Deadline Countdown for Exams⁩

Caught exception:
Traceback (most recent call last):
File "C:\Users\paula\AppData\Roaming\Anki2\addons21\1560797112_init_.py", line 190, in closeEvent
refreshDeadliner()
File "C:\Users\paula\AppData\Roaming\Anki2\addons21\1560797112_init_.py", line 36, in refreshDeadliner
dm.refresh()
File "C:\Users\paula\AppData\Roaming\Anki2\addons21\1560797112_init_.py", line 68, in refresh
self.deadlines = findDeadlines()
File "C:\Users\paula\AppData\Roaming\Anki2\addons21\1560797112_init.py", line 373, in findDeadlines
return [DeadlineStats(int(k), v["name"], v["deadline"]) for k,v in db.deadlines.items() if v['enabled']]
File "C:\Users\paula\AppData\Roaming\Anki2\addons21\1560797112_init_.py", line 373, in
return [DeadlineStats(int(k), v["name"], v["deadline"]) for k,v in db.deadlines.items() if v['enabled']]
File "C:\Users\paula\AppData\Roaming\Anki2\addons21\1560797112_init_.py", line 254, in init
avg_reps, avg_sec = self.get_train_stats(deck_id)
File "C:\Users\paula\AppData\Roaming\Anki2\addons21\1560797112_init_.py", line 348, in get_train_stats
childDeck[1] for childDeck in mw.col.decks.children(self.deck_id)
File "anki.decks", line 468, in children
File "anki.decks", line 461, in deck_and_child_name_ids
File "anki._backend_generated", line 370, in get_deck_and_child_names
File "anki._backend", line 151, in _run_command
anki.errors.NotFoundError: Your database appears to be in an inconsistent state. Please use the Check Database action.

[nairboon]

please try to update the Addon to the latest version and check if this fixes your error