HKUDS/nanobot · error · RuntimeError

Mattermost client is not started

Error message

Mattermost client is not started

What it means

Error "Mattermost client is not started" thrown in HKUDS/nanobot.

Source

Thrown at nanobot/channels/mattermost/runtime.py:649

            self._stream_root_ids[stream_id] = root_id
        committed = self._stream_committed.get(stream_id, "")
        buf = committed + delta
        self._stream_buffers[stream_id] = buf
        self._stream_committed[stream_id] = buf
        return

    def _clear_stream_state(self, stream_id: str) -> None:
        self._stream_root_ids.pop(stream_id, None)
        self._stream_posts.pop(stream_id, None)
        self._stream_buffers.pop(stream_id, None)
        self._stream_last_content.pop(stream_id, None)
        self._stream_committed.pop(stream_id, None)

    # API helpers ---------------------------------------------------------------

    def _require_http_client(self) -> httpx.AsyncClient:
        if self._http_client is None:
            raise RuntimeError("Mattermost client is not started")
        return self._http_client

    async def _api_get(self, path: str) -> dict[str, Any]:
        resp = await self._require_http_client().get(path)
        resp.raise_for_status()
        return cast(dict[str, Any], resp.json())

    async def _api_post(self, path: str, json_data: dict[str, Any]) -> dict[str, Any]:
        resp = await self._require_http_client().post(path, json=json_data)
        resp.raise_for_status()
        return cast(dict[str, Any], resp.json())

    async def _create_post(
        self,
        channel_id: str,
        message: str,
        *,
        root_id: str | None = None,

View on GitHub (pinned to 42f37dc4c0)

When it happens

Trigger: Thrown at nanobot/channels/mattermost/runtime.py:649 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of HKUDS/nanobot@42f37dc4c0 (2026-08-26). Data as JSON: /api/errors/c058f75fc4a5f17d. Report an issue: GitHub.