Image Occlusion One by One no longer working

🙋 Support
1

I’ve been using IO one by one for flow-chart style images. I just tried to create an IO one by one card but any card I create now says “the front of this card is empty”. The old cards I made with this add on still work, I just can’t create new ones. I believe I am up to date with the latest anki version and I haven’t updated anki between when I was able to make these cards and now so I’m not sure how to fix this.

2

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3
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Anki’s built‑in Image Occlusion and the old Image Occlusion One by One add‑on don’t work together perfectly anymore, and “The front of this card is empty” usually means Anki can’t find any content on the front template for that note type.

A few quick things to try:

  1. Confirm which note type you’re using

    • Open the Browser → find one of the old, working IO‑one‑by‑one cards.
    • Look at the Note Type (top right).
    • Now select one of the new, broken cards and check if it’s the same note type.
    • If the new ones are using Image Occlusion (the native one) instead of your old add‑on note type, that would explain the issue. In that case, stick to the native IO workflow (no one‑by‑one add‑on) or keep using the legacy add‑on note type consistently.

  2. Check the card template isn’t empty

    • Tools → Manage Note Types → select the IO One by One note type you used before → Cards….
    • On the Front Template, make sure there’s something like
      {{Image}} or {{cloze:Text}} or whatever the add‑on normally uses.
    • If the front template is blank or only has a comment, Anki will show “front of this card is empty.”
    • You can compare with a backup profile or with a working IO one‑by‑one note type if you still have it.

  3. Verify the fields actually have data

    • In the Browser, select one of the broken notes and click Cards → Preview.
    • Then click Edit on that note and confirm that:
      • The image field is filled.
      • Any cloze / mask fields used by the template are not empty.
    • If the image ended up in a different field than the one referenced in the template, the front will be considered empty.

  4. Try using native Image Occlusion instead

    • Since Anki now has built‑in Image Occlusion, many older IO add‑ons (including one‑by‑one) are no longer maintained and can break between versions.
    • Workflow with native IO:
      • Add → change Type to Image Occlusion → Select Image → draw shapes → choose Hide One, Guess One (closest to one‑by‑one flow) → Add.
    • This should work reliably in current Anki versions and doesn’t rely on the add‑on.

  5. If nothing above helps

    • Please share:
      • Your Anki version (e.g., 23.12.x).
      • The exact note type name you’re using for these new cards.
      • A screenshot of:
        • The Fields list for that note type.
        • The Front Template for that note type.
        • The Editor for one of the broken notes (showing what’s in each field).
    • With those, we can usually pinpoint whether it’s:
      • A broken template,
      • A field mismatch,
      • Or an incompatibility between the old IO One by One add‑on and your current Anki version.

In the meantime, if you need to keep studying, I’d recommend creating new cards using Anki’s native Image Occlusion note type, as that’s the officially supported path going forward and works well with AnkiHub‑shared decks.

6

If you used to use Closet, uninstall/disable it and try the AnKing Note Types add-on instead. It adds a similar button to the editor.