Comfy-Org/ComfyUI · error · ValueError

source_generation_id is required (connect the generation_id

Error message

source_generation_id is required (connect the generation_id output of a prior Luma Ray 3.2 node).

What it means

Raised by the Luma Ray 3.2 extend node (comfy_api_nodes/nodes_luma.py:1457) when source_generation_id is empty after stripping whitespace. The node continues a prior generation by id; without it there is nothing to extend, so it fails before building the request.

Source

Thrown at comfy_api_nodes/nodes_luma.py:1457

                IO.String.Output(display_name="generation_id"),
            ],
            hidden=[
                IO.Hidden.auth_token_comfy_org,
                IO.Hidden.api_key_comfy_org,
                IO.Hidden.unique_id,
            ],
            is_api_node=True,
            price_badge=_BADGE_RAY32_VIDEO_5S,
        )

    @classmethod
    async def execute(
        cls, source_generation_id: str, direction: dict, prompt: str, resolution: str, seed: int
    ) -> IO.NodeOutput:
        validate_string(prompt, strip_whitespace=False, min_length=1, max_length=6000)
        gen_id = (source_generation_id or "").strip()
        if not gen_id:
            raise ValueError(
                "source_generation_id is required (connect the generation_id output of a prior Luma Ray 3.2 node)."
            )
        video = Luma2VideoOptions(resolution=resolution, duration="5s")
        ref = Luma2ImageRef(generation_id=gen_id)
        if direction["direction"] == "Forward (continue after)":
            video.start_frame = ref
            if direction.get("loop"):
                video.loop = True
        else:
            video.end_frame = ref
        request = Luma2GenerationRequest(prompt=prompt, model="ray-3.2", type="video", video=video)
        return await _ray32_generate(cls, request)


class LumaExtension(ComfyExtension):
    @override
    async def get_node_list(self) -> list[type[IO.ComfyNode]]:
        return [

View on GitHub (pinned to 1c6d8d45b3)

Solutions

1. Connect the generation_id output of the prior Luma Ray 3.2 node into source_generation_id.
2. If typing an id manually, paste the complete id with no leading/trailing spaces.
3. Note the id must come from a Ray 3.2 generation still retained upstream.

if not (source_generation_id or "").strip():
    raise ValueError("Connect a prior Ray 3.2 node's generation_id output")

When it happens

Trigger: Executing the extend node with source_generation_id unconnected, an empty string, or whitespace-only input.

Common situations: User forgets to wire the generation_id output of the prior Ray 3.2 video node; hardcodes an id and pastes a blank; the upstream node was replaced and the edge lost.

Related errors

• Looping is only available with 5s duration on Ray 3.2.
• Provide at least one of start_frame / end_frame.
• Looping is not available when an end_frame is set.
• Connect at least 2 Luma Ray 3.2 Keyframe nodes (use Luma Ray
• Ray 3.2 supports at most 64 keyframes; got {len(items)}.

AI-assisted analysis of Comfy-Org/ComfyUI@1c6d8d45b3 (2026-08-14). Data as JSON: /api/errors/c61cce4f913153be. Report an issue: GitHub.