LykosAI/StabilityMatrix · warning · DataValidationException

File name already exists

Error message

File name already exists

What it means

In CheckpointFileViewModel.RenameAsync, the dialog Validator throws DataValidationException("File name already exists") when File.Exists confirms that parentPath + the entered name collides with an existing file. The rename is blocked to avoid overwriting another checkpoint file.

Solutions

1. Choose a unique file name that does not match any file in the target folder
2. If overwriting is intended, delete the existing file first, then rename
3. Add extension-aware or case-insensitive collision checking in the Validator if the current File.Exists check misses variants

Example fix

// before
if (File.Exists(Path.Combine(parentPath, text)))
    throw new DataValidationException("File name already exists");

// after
var candidate = Directory.EnumerateFiles(parentPath)
    .FirstOrDefault(f => string.Equals(Path.GetFileName(f), text, StringComparison.OrdinalIgnoreCase));
if (candidate is not null)
    throw new DataValidationException($"File name already exists: {Path.GetFileName(candidate)}");

// Validate before confirming the rename
var target = Path.Combine(parentPath, newName);
if (File.Exists(target))
    throw new DataValidationException("File name already exists");

bool IsFreeFileName(string parent, string name) =>
    !string.IsNullOrWhiteSpace(name) &&
    !Directory.EnumerateFiles(parent)
        .Any(f => string.Equals(Path.GetFileName(f), name, StringComparison.OrdinalIgnoreCase));

try
{
    await checkpointFileVm.RenameAsync();
}
catch (DataValidationException ex) when (ex.Message == "File name already exists")
{
    Logger.Debug("Rename aborted: target file already exists");
    // surface 'choose another name' in UI
}

When it happens

Trigger: Submitting the 'Rename Model' dialog with a name that matches an existing file in the same checkpoint folder (exact name, or same name ignoring case on case-insensitive filesystems).

Common situations: Renaming a model to a name another checkpoint already uses; duplicating a checkpoint then renaming the copy back to the original name; case-only renames on Windows/NTFS.

Understand the failure class

Background: "already exists" / EEXIST / FileAlreadyExistsException: what the 'file already exists' error means and how to fix it — this error's family across 37 libraries.

Related errors

• File name is required
• Resources.Validation_PackageNameCannotBeEmpty
• string.Format(Resources.ValidationError_PackageExists, text)
• Length cannot be null when latentType is Hunyuan
• Invalid Token

AI-assisted analysis of LykosAI/StabilityMatrix@af93d6ef57 (2026-09-12). Data as JSON: /api/errors/cb86ec8eb4b0d82b. Report an issue: GitHub.

Appendix: source

Thrown at StabilityMatrix.Avalonia/ViewModels/CheckpointManager/CheckpointFileViewModel.cs:353

    [RelayCommand]
    private async Task RenameAsync()
    {
        // Parent folder path
        var parentPath =
            Path.GetDirectoryName((string?)CheckpointFile.GetFullPath(settingsManager.ModelsDirectory)) ?? "";

        var textFields = new TextBoxField[]
        {
            new()
            {
                Label = "File name",
                Validator = text =>
                {
                    if (string.IsNullOrWhiteSpace(text))
                        throw new DataValidationException("File name is required");

                    if (File.Exists(Path.Combine(parentPath, text)))
                        throw new DataValidationException("File name already exists");
                },
                Text = CheckpointFile.FileName,
            },
        };

        var dialog = DialogHelper.CreateTextEntryDialog("Rename Model", "", textFields);

        if (await dialog.ShowAsync() == ContentDialogResult.Primary)
        {
            var name = textFields[0].Text;
            var nameNoExt = Path.GetFileNameWithoutExtension(name);
            var originalNameNoExt = Path.GetFileNameWithoutExtension(CheckpointFile.FileName);
            // Rename file in OS
            try
            {
                var newFilePath = Path.Combine(parentPath, name);
                File.Move(CheckpointFile.GetFullPath(settingsManager.ModelsDirectory), newFilePath);

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