What causes "No CUDA backend found to delete" in jamiepine/voicebox?

Treat a 404 here as success (the backend is already absent).

jamiepine/voicebox · warning · HTTPException

No CUDA backend found to delete

Error message

No CUDA backend found to delete

What it means

HTTP 404 raised by DELETE /backend/cuda when cuda.delete_cuda_binary() returns False. The service returns False when the CUDA directory does not exist or is empty (no files to remove). The endpoint interprets that as 'nothing to delete'.

Solutions

Treat a 404 here as success (the backend is already absent).
Check GET /backend/cuda status.available before offering delete.
Make the client delete idempotent: ignore 404.

Example fix

// before
const r = await fetch('/backend/cuda', { method: 'DELETE' });
if (!r.ok) throw new Error('delete failed');
// after
const r = await fetch('/backend/cuda', { method: 'DELETE' });
if (r.status === 404) { /* nothing to delete */ }
else if (!r.ok) throw new Error('delete failed');

Defensive patterns

Strategy: try-catch

Validate before calling

const status = await fetch('/backend/cuda').then(r => r.json());
if (!status.available) throw new Error('nothing to delete');

Try / catch

const r = await fetch('/backend/cuda', { method:'DELETE' });
if (r.status === 404) { /* already absent — success */ }

Prevention

Treat 404 on this delete as success.
Check status.available before offering delete.
Dedupe repeated delete requests.

When it happens

Trigger: Calling DELETE /backend/cuda when no CUDA backend was ever downloaded, or after it was already deleted.

Common situations: User clicks delete twice; cleanup script runs against a fresh install; a prior delete already removed the directory.

Related errors

AI-assisted analysis of jamiepine/voicebox@51f49dea19 (2026-08-12). Data as JSON: /api/errors/134dcfa8ec35c839. Report an issue: GitHub.

Appendix: source

Thrown at backend/routes/cuda.py:64

    create_background_task(_download())
    return {"message": "CUDA backend download started", "progress_key": "cuda-backend"}


@router.delete("/backend/cuda")
async def delete_cuda_backend():
    """Delete the downloaded CUDA backend binary."""
    from ..services import cuda

    if cuda.is_cuda_active():
        raise HTTPException(
            status_code=409,
            detail="Cannot delete CUDA backend while it is active. Switch to CPU first.",
        )

    deleted = await cuda.delete_cuda_binary()
    if not deleted:
        raise HTTPException(status_code=404, detail="No CUDA backend found to delete")

    return {"message": "CUDA backend deleted"}


@router.get("/backend/cuda-progress")
async def get_cuda_download_progress():
    """Get CUDA backend download progress via Server-Sent Events."""
    progress_manager = get_progress_manager()

    async def event_generator():
        async for event in progress_manager.subscribe("cuda-backend"):
            yield event

    return StreamingResponse(
        event_generator(),
        media_type="text/event-stream",
        headers={
            "Cache-Control": "no-cache",

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