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# What does this implement/fix?
When a stored YouTube Music cookie is no longer a valid session, YouTube
does not
answer with an auth error. It returns its normal signed-out page.
`ytmusicapi`'s
`nav()` then fails on the unexpected payload and raises a `KeyError`
with the whole
page embedded in the message, which ended up verbatim in the UI and the
log:
```
Error handling message: music/refresh_item: "Unable to find 'twoColumnBrowseResultsRenderer' using path [...] on {'singleColumnBrowseResultsRenderer': ... 'Sign in to listen to your liked tracks' ...}"
```
Nothing told the user their cookie needs replacing, and every library
sync kept
failing the same way.
- Route every `ytmusicapi` call through a wrapper that turns a
signed-out response into `LoginFailed` with an actionable message
- Unload the provider on that error during a library sync, so the user
is asked once for a fresh cookie instead of every sync failing silently
- Add regression tests for the translation, for unrelated `KeyError`s,
and for the unload
**Related issue (if applicable):**
- related issue https://github.com/music-assistant/support/issues/6031
## Types of changes
<!--
Tick exactly one box. CI (.github/workflows/pr-labels.yaml) derives
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- [x] Bugfix (non-breaking change which fixes an issue) — `bugfix`
- [ ] New feature (non-breaking change which adds functionality) —
`new-feature`
- [ ] Enhancement to an existing feature — `enhancement`
- [ ] New music/player/metadata/plugin provider — `new-provider`
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected) — `breaking-change`
- [ ] Refactor (no behaviour change) — `refactor`
- [ ] Documentation only — `documentation`
- [ ] Maintenance / chore — `maintenance`
- [ ] CI / workflow change — `ci`
- [ ] Dependencies bump — `dependencies`
## Checklist
- [x] The code change is tested and works locally.
- [x] `pre-commit run --all-files` passes.
- [x] `pytest` passes, and tests have been added/updated under `tests/`
where applicable.
- [ ] For changes to shared models, the companion PR in
`music-assistant/models` is linked.
- [ ] For changes affecting the UI, the companion PR in
`music-assistant/frontend` is linked.
- [x] I have read and complied with the project's [AI
Policy](https://github.com/music-assistant/.github/blob/main/AI_POLICY.md)
for any AI-assisted contributions.
- [ ] I have [raised a PR against the documentation
repository](https://github.com/music-assistant/music-assistant.io/blob/main/CONTRIBUTING.md)
targeting the main or beta branch as appropriate.