HKUDS/nanobot · error · ImageGenerationError

generated image payload was not valid base64

Error message

generated image payload was not valid base64

What it means

Error "generated image payload was not valid base64" thrown in HKUDS/nanobot.

Source

Thrown at nanobot/providers/image_generation.py:124

def image_path_to_data_url(path: str | Path) -> str:
    """Convert a local image path to an image data URL."""
    mime, encoded = _read_image_b64(path)
    return f"data:{mime};base64,{encoded}"


def image_path_to_inline_data(path: str | Path) -> dict[str, str]:
    """Convert a local image path to a Gemini ``inlineData`` payload dict."""
    mime, encoded = _read_image_b64(path)
    return {"mimeType": mime, "data": encoded}


def _b64_image_data_url(value: str) -> str:
    encoded = "".join(value.split())
    try:
        raw = base64.b64decode(encoded, validate=True)
    except binascii.Error as exc:
        raise ImageGenerationError("generated image payload was not valid base64") from exc
    mime = detect_image_mime(raw)
    if mime is None:
        raise ImageGenerationError("generated image payload was not a supported image")
    return f"data:{mime};base64,{encoded}"


def _aihubmix_size(aspect_ratio: str | None, image_size: str | None) -> str:
    """Return an OpenAI Images API size string for AIHubMix.

    The WebUI emits compact size hints like ``1K`` for OpenRouter. AIHubMix's
    Images API expects OpenAI-style dimensions or ``auto``, so only pass
    through explicit dimension strings and otherwise derive the closest
    supported orientation from aspect ratio.
    """
    if image_size and "x" in image_size.lower():
        return image_size
    if aspect_ratio in _AIHUBMIX_ASPECT_RATIO_SIZES:
        return _AIHUBMIX_ASPECT_RATIO_SIZES[aspect_ratio]

View on GitHub (pinned to 42f37dc4c0)

When it happens

Trigger: Thrown at nanobot/providers/image_generation.py:124 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/2ddb5ea3e592aa2d. Report an issue: GitHub.