BerriAI/litellm · error · ValueError

RunwayML TTS response missing task ID

Error message

RunwayML TTS response missing task ID

What it means

Contract guard in the RunwayML TTS response transformation: the JSON body contains no 'id', so there is no task identifier to poll for audio completion and the transformation aborts with this error.

Source

Thrown at litellm/llms/runwayml/text_to_speech/transformation.py:469

        }
        """
        from litellm.types.llms.openai import HttpxBinaryResponseContent

        try:
            response_data: Final = raw_response.json()
        except Exception as e:
            raise self.get_error_class(
                error_message=f"Error parsing RunwayML TTS response: {e}",
                status_code=raw_response.status_code,
                headers=dict(raw_response.headers),
            )

        verbose_logger.debug("RunwayML TTS starting polling...")

        # Get task ID
        task_id: Final = response_data.get("id")
        if not task_id:
            raise ValueError("RunwayML TTS response missing task ID")

        # Get headers for polling (need auth)
        poll_headers: Final = {
            "Authorization": raw_response.request.headers.get("Authorization", ""),
            "X-Runway-Version": raw_response.request.headers.get("X-Runway-Version", RUNWAYML_DEFAULT_API_VERSION),
        }

        # Poll until task completes
        polled_response: Final = self._poll_task_sync(
            task_id=task_id,
            api_base=self.DEFAULT_BASE_URL,
            headers=poll_headers,
            timeout_secs=RUNWAYML_POLLING_TIMEOUT,
        )

        # Get the completed task data
        task_data: Final = polled_response.json()

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. Inspect the raw RunwayML response; the task id field was absent.
2. Verify API key and request body.

Example fix

# log the response body to inspect the actual payload.

When it happens

Trigger: Triggered when the RunwayML TTS response does not contain a task ID.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/c1f580a1f6c60438. Report an issue: GitHub.