dosubot[bot] commented on issue #35722: URL: https://github.com/apache/superset/issues/35722#issuecomment-3418478267
<!-- Answer --> This error happens because Superset 6.0.0rc2 expects Flask-AppBuilder (FAB) 5.x, which provides the flask_appbuilder.utils.legacy module, but the docker image is likely using an older FAB version (such as 4.x) that doesn't include it. This mismatch triggers the ModuleNotFoundError you’re seeing. A fix for this was merged in Superset to handle the missing module gracefully by falling back to flask_sqlalchemy.SQLAlchemy if the import fails. You can see the details in [PR #35235](https://github.com/apache/superset/pull/35235). Superset upgraded to FAB 5.x in [PR #33055](https://github.com/apache/superset/pull/33055), so Superset 6.0.0rc2 and later require FAB 5.x. To resolve this, make sure your docker image is using Flask-AppBuilder 5.x. If you’re using an official image and still seeing this error, try pulling the latest image after the fix was merged (post-2025-09-23), or manually update the FAB version in your environment to 5.x. If you need more details on breaking changes and migration, check the [UPDATING.md](https://github.com/apache/superset/blob/master/UPDATING.md) file. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/5baad978-60a2-4690-8091-6f7c8cdb0419?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/5baad978-60a2-4690-8091-6f7c8cdb0419?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/5baad978-60a2-4690-8091-6f7c8cdb0419?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/5baad978-60a2-4690-8091-6f7c8cdb0419?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/5baad978-60a2-4690-8091-6f7c8cdb0419?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/5baad978-60a2-4690-8091-6f7c8cdb0419?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/5baad978-60a2-4690-8091-6f7c8cdb0419?feedback_type=other)</sup> [](https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/ask?utm_source=githu b) [](https://go.dosu.dev/discord-bot) [](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/apache/superset/issues/35722) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
