Comfy-Org/ComfyUI · error · ValueError

At least one reference image is required.

Error message

At least one reference image is required.

What it means

Error "At least one reference image is required." thrown in Comfy-Org/ComfyUI.

Source

Thrown at comfy_api_nodes/nodes_reve.py:377

        model: dict,
        upscale: dict,
        remove_background: bool,
        seed: int,
    ) -> IO.NodeOutput:
        validate_string(prompt, min_length=1, max_length=2560)
        if not reference_images:
            raise ValueError("At least one reference image is required.")
        ref_base64_list = []
        for key in reference_images:
            ref_base64_list.append(tensor_to_base64_string(reference_images[key]))

View on GitHub (pinned to 1c6d8d45b3)

Solutions

1. Connect at least one reference image.

When it happens

Trigger: Thrown at comfy_api_nodes/nodes_reve.py:377 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Comfy-Org/ComfyUI@1c6d8d45b3 (2026-08-14). Data as JSON: /api/errors/2d1bd30815cae3db. Report an issue: GitHub.