LykosAI/StabilityMatrix · warning · DataValidationException

File name is required

Error message

File name is required

What it means

In CheckpointFileViewModel.RenameAsync, the rename dialog's Validator throws DataValidationException("File name is required") when the user submits an empty or whitespace-only name. The dialog blocks the rename until a valid non-empty name is entered.

Solutions

1. Type a non-empty file name (including its extension) in the dialog and confirm
2. Cancel the dialog if you did not intend to rename
3. If triggered programmatically, pass the existing CheckpointFile.FileName as the default Text so empty submissions cannot occur

Example fix

// before
Text = CheckpointFile.FileName, // user may clear it

// after
Text = CheckpointFile.FileName,
Validator = text =>
{
    if (string.IsNullOrWhiteSpace(text))
        throw new DataValidationException("File name is required");
    if (!Path.HasExtension(text) && Path.HasExtension(CheckpointFile.FileName))
        text = text + Path.GetExtension(CheckpointFile.FileName); // preserve extension
    if (File.Exists(Path.Combine(parentPath, text)))
        throw new DataValidationException("File name already exists");
}

// Validate before confirming the rename
if (string.IsNullOrWhiteSpace(newName))
    throw new DataValidationException("File name is required");

bool IsValidFileName(string? name) =>
    !string.IsNullOrWhiteSpace(name) && name.IndexOfAny(Path.GetInvalidFileNameChars()) < 0;

try
{
    await checkpointFileVm.RenameAsync();
}
catch (DataValidationException ex) when (ex.Message == "File name is required")
{
    // Dialog already surfaces this; log for telemetry only
    Logger.Debug("Rename aborted: empty file name");
}

When it happens

Trigger: Submitting the 'Rename Model' text-entry dialog (launched from RenameAsync on a CheckpointFileViewModel) with an empty string or only whitespace in the 'File name' field.

Common situations: Pressing Enter/clicking OK without typing a name; accidentally clearing the pre-filled Text (CheckpointFile.FileName) before confirming.

Understand the failure class

Background: "must not be empty", "cannot be empty" — required-field validation errors across open-source libraries — this error's family across 41 libraries.

Related errors

• File name already exists
• Resources.Validation_PackageNameCannotBeEmpty
• Name is required
• Pack already exists
• Length cannot be null when latentType is Hunyuan

AI-assisted analysis of LykosAI/StabilityMatrix@af93d6ef57 (2026-09-12). Data as JSON: /api/errors/b7bfff72289d7058. Report an issue: GitHub.

Appendix: source

Thrown at StabilityMatrix.Avalonia/ViewModels/CheckpointManager/CheckpointFileViewModel.cs:350

        await modelIndexService.RemoveModelAsync(CheckpointFile);
    }

    [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
            {

View on GitHub (pinned to af93d6ef57)