langflow-ai/langflow · error · HTTPException

Deployment mapper llm list result payload is missing.

Error message

Deployment mapper llm list result payload is missing.

What it means

Error "Deployment mapper llm list result payload is missing." thrown in langflow-ai/langflow.

Source

Thrown at src/backend/base/langflow/api/v1/mappers/deployments/watsonx_orchestrate/mapper.py:1073

        )

    def shape_llm_list_result(self, result: DeploymentListLlmsResult) -> DeploymentLlmListResponse:
        adapter_provider_result = self.parse_adapter_slot(
            slot=WXO_ADAPTER_PAYLOAD_SCHEMAS.deployment_llm_list_result,
            slot_name="deployment_llm_list_result",
            raw=result.provider_result,
            operation="listing available models",
        )
        api_slot = self.api_payloads.deployment_llm_list_result
        if api_slot is None:
            msg = "Watsonx deployment_llm_list_result payload slot is not configured."
            raise HTTPException(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=msg)
        try:  # straight pass-through today, so just dump + validate
            api_provider_result: WatsonxApiDeploymentLlmListResultData = api_slot.parse(
                adapter_provider_result.model_dump(exclude_none=True)
            )
        except AdapterPayloadMissingError as exc:
            raise HTTPException(
                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
                detail="Deployment mapper llm list result payload is missing.",
            ) from exc
        except AdapterPayloadValidationError as exc:
            detail = exc.format_first_error()
            raise HTTPException(
                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
                detail=f"Deployment mapper llm list result payload is invalid: {detail}",
            ) from exc
        return DeploymentLlmListResponse(provider_data=api_provider_result.model_dump(mode="json", exclude_none=True))

    def util_create_snapshot_bindings(
        self,
        *,
        result: DeploymentCreateResult,
    ) -> CreateSnapshotBindings:
        slot = WXO_ADAPTER_PAYLOAD_SCHEMAS.deployment_create_result
        parsed = self.parse_adapter_slot(

View on GitHub (pinned to 976ec789d2)

Solutions

1. Retry the request; the mapper returned no LLM list payload. Check the watsonx provider configuration.

When it happens

Trigger: Occurs when the mapper's llm list result payload is missing entirely.

Common situations: See trigger scenarios.

AI-assisted analysis of langflow-ai/langflow@976ec789d2 (2026-08-14). Data as JSON: /api/errors/6d8adc279ab502ff. Report an issue: GitHub.