Failed to download models from argmaxinc/ttskit-coreml. Check that the repo exists and you have access

[zaidbren]

Hello everyone, I am using TTSKit, and I am using few commit old version, specifically "2397168", and its the one by which I published the app. Today, I accidently deleted the Hugging face models from my system and when I try to redownload it in my app, I am getting issues, where it would throw errors like :-

[QwenTTS] Download failed for Qwen 1.7B: generationFailed("Failed to download models from argmaxinc/ttskit-coreml. Check that the repo exists and you have access. and sometimes :-

[QwenTTS] Download failed for Qwen 1.7B: generationFailed("Failed to download models from argmaxinc/ttskit-coreml. Check that the repo exists and you have access. Error: “weight.bin.46f8ac7940915bf46cb15cd16ac06c1cf306044aebf6ade6253831539e61cb88.incomplete” couldn’t be moved to “weights” because either the former doesn’t exist, or the folder containing the latter doesn’t exist.")

Mostly its stuck the download at a certain point and it can't move furthur.

func downloadModel(_ variant: QwenTTSVariant) async {
    if case .downloading = modelStates[variant] { return }  // already in progress
    guard modelStates[variant]?.isDownloaded != true else { return }

    modelStates[variant] = .downloading(progress: 0)
    downloadProgress[variant] = 0
    statusMessage = "Downloading \(variant.displayName)…"

    do {
        let config = TTSKitConfig(model: variant.ttsModelVariant, verbose: true)
        let folder = try await TTSKit.download(config: config) { [weak self] progress in
            Task { @MainActor [weak self] in
                self?.downloadProgress[variant] = progress.fractionCompleted
                self?.modelStates[variant] = .downloading(progress: progress.fractionCompleted)
            }
        }
        modelStates[variant] = .downloaded
        downloadProgress[variant] = 1.0
        statusMessage = "\(variant.displayName) downloaded"
        print("✅ [QwenTTS] Downloaded \(variant.displayName) → \(folder.path)")
    } catch {
        modelStates[variant] = .error(error.localizedDescription)
        statusMessage = "Download failed: \(error.localizedDescription)"
        print("❌ [QwenTTS] Download failed for \(variant.displayName): \(error)")
    }
}

private func localRepoURL(for config: TTSKitConfig) -> URL {
    documentsDirectory
        .appendingPathComponent(Self.modelStorageBase)
        .appendingPathComponent(config.modelRepo)
}

private func hasModelFiles(at repoURL: URL, config: TTSKitConfig) -> Bool {
    config.componentDirectories(in: repoURL).contains {
        FileManager.default.fileExists(atPath: $0.path)
    }
}

AISettingsView.swift — UI that triggers download
swift// QwenTTSSection wires up the download button:

QwenModelRow(
    variant:      variant,
    state:        manager.modelStates[variant] ?? .notDownloaded,
    progress:     manager.downloadProgress[variant] ?? 0,
    isDefault:    manager.defaultVariant == variant,
    onDownload:  { Task { await manager.downloadModel(variant) } },
    onSetDefault: { manager.setDefaultVariant(variant) }
)

// QwenModelRow — the Download / Retry buttons:
case .notDownloaded:
    Button("Download") { onDownload() }

case .downloading(let p):
    ProgressView(value: p)
        .progressViewStyle(.linear)
        .frame(width: 80)
    Text(p > 0 ? "\(Int(p * 100))%" : "Starting…")

case .error:
    Image(systemName: "exclamationmark.triangle.fill").foregroundStyle(.red)
    Button("Retry") { onDownload() }

[ZachNagengast]

What version of swift-transformers are you using? One thing to try is if you deleted the model make sure the full directory is also deleted, swift-transformers uses a cache and is likely not expecting the destination folder to be missing if it has a cache for an incomplete model. Lmk if the issue persists after deleting the fill storage folder, in our example app you can see the recommended way to delete models so that issue wont show up in the field: https://github.com/argmaxinc/WhisperKit/blob/d447d308cb6e32df8165d4cfb8f1bf955592590f/Examples/TTS/TTSKitExample/TTSKitExample/ViewModel.swift#L576-L581