# Anki Deck Is Not Opening **URL:** \ **Category:** Help\ **Created:** [December 10, 2025, 1:09am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750 "2025-12-10T01:09:12Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![CindyK](https://avatars.discourse-cdn.com/v4/letter/c/5fc32e/32.png) [@CindyK](https://forums.ankiweb.net/u/CindyK)\ **Post date:** [December 10, 2025, 1:09am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750/1 "2025-12-10T01:09:12Z")
Any time I try to open my anki deck, it says “invalid params”. I have tried restarting my laptop, downloading a new version of Anki. Can someone help me with this? ---
**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:** [December 10, 2025, 1:19am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750/2 "2025-12-10T01:19:15Z")
- Go to the Options for that deck/subdeck. - Delete your FSRS parameters. - Click Optimize to get new parameters and Save. ---
**Author:** ![CindyK](https://avatars.discourse-cdn.com/v4/letter/c/5fc32e/32.png) [@CindyK](https://forums.ankiweb.net/u/CindyK)\ **Post date:** [December 10, 2025, 2:12am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750/3 "2025-12-10T02:12:47Z")
Thank you so much!! ---
**Author:** ![pavreh](https://avatars.discourse-cdn.com/v4/letter/p/0ea827/32.png) [@pavreh](https://forums.ankiweb.net/u/pavreh)\ **Post date:** [December 11, 2025, 8:31am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750/4 "2025-12-11T08:31:31Z")
> [@CindyK](#): > > Any time I try to open my anki deck, it says “invalid params”. It would be a good function, if Anki, instead of the warning dialog “invalid params”, showed a dialog: “invalid params, correcting…” and recalculated the params automatically. ---
**Author:** ![pavreh](https://avatars.discourse-cdn.com/v4/letter/p/0ea827/32.png) [@pavreh](https://forums.ankiweb.net/u/pavreh)\ **Post date:** [December 11, 2025, 8:39am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750/5 "2025-12-11T08:39:51Z")
OK, I can answer myself 🙂 [quote=“dae, post:3, topic:36715”] Automatic rebuilding is unlikely to happen, as that would result in all cards being marked as changed without any user interaction, and could cause the user to lose progress if they weren’t fully in sync when it happened. [/quote] ---
**Author:** ![pavreh](https://avatars.discourse-cdn.com/v4/letter/p/0ea827/32.png) [@pavreh](https://forums.ankiweb.net/u/pavreh)\ **Post date:** [December 11, 2025, 8:48am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750/6 "2025-12-11T08:48:53Z")
In this case, it should be communicated in Help that it is better to be fully synced on all devices before optimising parameters. ---
**Author:** ![abdo](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/abdo/32/654_2.png) [@abdo](https://forums.ankiweb.net/u/abdo)\ **Post date:** [December 15, 2025, 7:10am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750/7 "2025-12-15T07:10:47Z")
There are open issues for improving this: > > > This request is basically for future-proofing because saving deck options with i…nvalid parameters isn't possible. > > \ > As David said, we need a reasonable solution to handle the following cases > > \- AnkiDroid \> Anki Desktop > AnkiDroid auto-updates and the user does not want to update Anki due to addon compat. Anki Desktop is broken > > \- AnkiDroid \< Anki Desktop > A user does not want to/cannot update AnkiDroid (e.g. due to regressions, or their device no longer being supported). AnkiDroid is broken > > To be fair, we can replace AnkiDroid with AnkiMobile here and the arguments remain valid. So, it is truly an ecosystem compatibility issue. > > The main issue is the UX > \> The current error provides the user neither explanation nor context (what is a parameter), nor action to take to fix the issue > \> > \> \ > > Though I am happy with the solution that Damien proposed in https://github.com/ankidroid/Anki-Android/issues/17236#issuecomment-2408394699, David (and I) think that we should go a step ahead to make the UX better. > > \### Proposed solution: > If the user has invalid parameters, the error message in the reviewer should have a button to optimize the parameters. > > > \> Users don’t know how to resolve this error, and we don’t auto-fix it: > \> > \> May…be using something similar to deck-config-invalid-parameters (if the error is similar): > \> The provided FSRS parameters are invalid. Leave them blank to use the default parameters. > \> > > Originally reported on https://forums.ankiweb.net/t/ux-improve-invalid-params-provided-error/65557/2 > > Linking to a new FAQ would be good too. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\ **Post date:** [January 14, 2026, 7:10am UTC](https://forums.ankiweb.net/t/anki-deck-is-not-opening/67750/8 "2026-01-14T07:10:53Z")
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