# Synchronization Problem **URL:** \ **Category:** Syncing & AnkiWeb\ **Created:** [September 8, 2024, 8:25am UTC](https://forums.ankiweb.net/t/synchronization-problem/49169 "2024-09-08T08:25:22Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![hanhan18](https://avatars.discourse-cdn.com/v4/letter/h/ba8739/32.png) [@hanhan18](https://forums.ankiweb.net/u/hanhan18)\ **Post date:** [September 8, 2024, 8:25am UTC](https://forums.ankiweb.net/t/synchronization-problem/49169/1 "2024-09-08T08:25:22Z")
Yesterday i downloaded a deck and edited it. And today i couldnt close anki, because it said i needed to do a special synchronization. I cant close the app, cant open any decks and the deck I edited is not on Anki Web or other devices yet. This message always pops up: Anki encountered a problem. Please follow the troubleshooting steps. Das Problem wird vielleicht von Erweiterung verursacht. → Fehlerbehebung → Debug-Information kopieren" I think the problem could be my Amboss Add-on. I can`t deactivate it though because my entire Anki is frozen. Anki 23.12.1 (1a1d4d54) (ao) Python 3.9.15 Qt 6.5.3 PyQt 6.5.3 Platform: macOS-11.7.10-x86\_64-i386-64bit Traceback (most recent call last): File “aqt.taskman”, line 142, in \_on\_closures\_pending File “aqt.taskman”, line 86, in File “aqt.taskman”, line 106, in wrapped\_done File “aqt.sync”, line 107, in on\_future\_done File “anki.collection”, line 209, in \_load\_scheduler File “anki.collection”, line 202, in sched\_ver File “anki.config”, line 81, in get File “anki.config”, line 62, in **getitem** File “anki.config”, line 43, in get\_immutable File “anki.\_backend\_generated”, line 555, in get\_config\_json File “anki.\_backend”, line 166, in \_run\_command anki.errors.InvalidInput: CollectionNotOpen ===Add-ons (active)=== (add-on provided name [Add-on folder, installed at, version, is config changed]) AMBOSS add-on [‘0amboss\_addon’, 2024-08-05T16:24, ‘None’, ‘’] Image Occlusion Enhanced for Anki 21 alpha [‘1374772155’, 2022-04-09T09:15, ‘None’, ‘’] ===IDs of active AnkiWeb add-ons=== 1374772155 ===Add-ons (inactive)=== (add-on provided name [Add-on folder, installed at, version, is config changed]) ---
**Author:** ![sorata](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/sorata/32/34115_2.png) [@sorata](https://forums.ankiweb.net/u/sorata)\ **Post date:** [September 8, 2024, 11:49am UTC](https://forums.ankiweb.net/t/synchronization-problem/49169/2 "2024-09-08T11:49:52Z")
Try #2 from here: [Troubleshooting - Anki Manual](https://docs.ankiweb.net/troubleshooting.html) Holding down Shift while opening the app should disable the add-ons. ---
**Author:** ![Danika\_Dakika](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/danika_dakika/32/17815_2.png) [@Danika\_Dakika](https://forums.ankiweb.net/u/Danika_Dakika)\ **Post date:** [September 8, 2024, 3:50pm UTC](https://forums.ankiweb.net/t/synchronization-problem/49169/3 "2024-09-08T15:50:43Z")
Were all of your devices in sync before you downloaded this new deck on desktop Anki? If so, it’s safe to do that “special” sync – you need to choose **upload to AnkiWeb**. If your devices _were not_ in sync before you did this, you’re going to have to make some careful decisions or you risk losing some of your data. > [@hanhan18](#): > > I cant close the app, cant open any decks … > > … my entire Anki is frozen. Are you stuck because you don’t want to go forward with the sync? Or is your app actually frozen/crashed? ---
**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\ **Post date:** [October 8, 2024, 3:51pm UTC](https://forums.ankiweb.net/t/synchronization-problem/49169/4 "2024-10-08T15:51:38Z")
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