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Posted to notifications@superset.apache.org by "dosubot[bot] (via GitHub)" <gi...@apache.org> on 2026/05/02 03:15:42 UTC
Re: [D] Question: Encountered "Failed to save slice" error when saving chart to dashboard [superset]
GitHub user dosubot[bot] edited a comment on the discussion: Question: Encountered "Failed to save slice" error when saving chart to dashboard
<!-- Answer -->
This is a known issue with several potential causes. Here are the most common ones and their solutions:
**1. Invalid color fields in chart metadata**
This is frequently the culprit. Try editing the chart, going to the "Advanced" section, and removing or clearing the `map_label_colors` or `shared_label_colors` fields ([related fix](https://github.com/apache/superset/issues/32644#issuecomment-2720488336)).
**2. Frontend/backend version mismatch**
If you're running Superset in a distributed setup, ensure both frontend and backend are on the exact same version. Even minor mismatches can cause [schema validation errors](https://github.com/apache/superset/issues/35082#issuecomment-3273375195).
**3. NULL query_context (common after imports)**
If you imported this dashboard via a zip file, charts may have NULL `query_context`. Re-opening and re-saving each chart in the Explore view [rebuilds the query context](https://github.com/apache/superset/issues/33615).
**4. Permission issues**
Verify you have "can write on dashboard" permission for the target dashboard.
**Troubleshooting tip:** Check your backend logs for the full error message/stack trace—it will give you more specific details about what's failing.
Also worth noting: several chart-saving bugs were fixed in versions after 4.0.1 ([PR #36441](https://github.com/apache/superset/pull/36441), [PR #36402](https://github.com/apache/superset/pull/36402)), so upgrading may help if the above doesn't resolve it.
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GitHub link: https://github.com/apache/superset/discussions/38618#discussioncomment-16111126
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