HKUDS/nanobot · error · ImageGenerationError

ModelScope did not return a task_id

Error message

ModelScope did not return a task_id: {response.text[:500]}

What it means

Raised in ModelScopeImageGenerator._generate_with_client after a 2xx submission response whose JSON body lacks a task_id. The async task API is expected to return task_id; its absence means the response shape is unexpected (API contract change or unexpected payload), so the polling phase cannot proceed.

Solutions

1. Log/inspect the full response body to see what ModelScope actually returned
2. Verify the ModelScope image_generation endpoint version/API contract
3. Update parsing if the API response schema changed

When it happens

Trigger: Thrown at nanobot/providers/image_generation.py:2045 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/04d4d3e2147c1a6f. Report an issue: GitHub.

Appendix: source

Thrown at nanobot/providers/image_generation.py:2045

        body: dict[str, Any],
    ) -> GeneratedImageResponse:
        try:
            response = await client.post(url, headers=headers, json=body)
        except httpx.TimeoutException as exc:
            raise ImageGenerationError("ModelScope image generation request timed out") from exc
        except httpx.RequestError as exc:
            raise ImageGenerationError(f"ModelScope image generation request failed: {exc}") from exc

        try:
            response.raise_for_status()
        except httpx.HTTPStatusError as exc:
            detail = _http_error_detail(response)
            raise ImageGenerationError(f"ModelScope image generation failed: {detail}") from exc

        task_data = response.json()
        task_id = task_data.get("task_id")
        if not task_id:
            raise ImageGenerationError(
                f"ModelScope did not return a task_id: {response.text[:500]}"
            )

        images = await self._poll_task(client, task_id, headers)

        self._require_images(images, task_data)
        return GeneratedImageResponse(images=images, content="", raw=task_data)

    async def _poll_task(
        self,
        client: httpx.AsyncClient,
        task_id: str,
        submit_headers: dict[str, str],
    ) -> list[str]:
        poll_headers = {
            "Authorization": submit_headers["Authorization"],
            "X-ModelScope-Task-Type": "image_generation",
            **self.extra_headers,

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