CoplayDev/unity-mcp · error · ArgumentException

Input path '{inputPath}' is not a valid ADB folder

Error message

Input path '{inputPath}' is not a valid ADB folder

What it means

Thrown when AssetDatabase.IsValidFolder returns false for one of the input paths in TypePreviewGeneratorBase.ValidateSettings. Each path is stripped of a trailing slash, then checked against the AssetDatabase (not the filesystem) — meaning the folder must be inside the Unity project and imported. A path that exists on disk but not in ADB still fails.

Source

Thrown at TestProjects/AssetStoreUploads/Packages/com.unity.asset-store-tools/Editor/Previews/Scripts/Generators/Custom/TypeGenerators/TypePreviewGeneratorBase.cs:32

        public TypeGeneratorSettings Settings { get; }

        public abstract event Action<int, int> OnAssetProcessed;

        public TypePreviewGeneratorBase(TypeGeneratorSettings settings)
        {
            Settings = settings;
        }

        public virtual void ValidateSettings()
        {
            if (Settings.InputPaths == null || Settings.InputPaths.Length == 0)
                throw new ArgumentException("Input path cannot be null");

            foreach (var path in Settings.InputPaths)
            {
                var inputPath = path.EndsWith("/") ? path.Remove(path.Length - 1) : path;
                if (!AssetDatabase.IsValidFolder(inputPath))
                    throw new ArgumentException($"Input path '{inputPath}' is not a valid ADB folder");
            }

            if (string.IsNullOrEmpty(Settings.OutputPath))
                throw new ArgumentException("Output path cannot be null");
        }

        public async Task<List<PreviewMetadata>> Generate()
        {
            var generatedPreviews = new List<PreviewMetadata>();
            ValidateSettings();

            var assets = CollectAssets();
            assets = FilterIgnoredAssets(assets);

            if (assets.Count() == 0)
                return generatedPreviews;

            return await GenerateImpl(assets);

View on GitHub (pinned to c21bf496bc)

Solutions

1. Ensure each InputPath is a relative path inside the Assets/ folder (e.g., 'Assets/MyFolder').
2. Verify the folder exists in the Project window (which reflects ADB state), not just in the file explorer.
3. If the folder was recently created, trigger an AssetDatabase.Refresh() before validation.
4. Normalize path separators and remove trailing slashes before passing paths to settings.

Example fix

// before
var settings = new TextureTypeGeneratorSettings { InputPaths = new[] { "/home/user/textures", "C:/Textures" }, ... };

// after
var settings = new TextureTypeGeneratorSettings { InputPaths = new[] { "Assets/Textures" }, ... };

foreach (var path in settings.InputPaths)
{
    var cleanPath = path.TrimEnd('/');
    if (!AssetDatabase.IsValidFolder(cleanPath))
        Debug.LogError($"'{cleanPath}' is not a valid AssetDatabase folder. Ensure it is inside the Assets/ directory.");
}
// Trigger refresh if folders may be stale
AssetDatabase.Refresh();

static bool AreAllInputPathsValidADB(string[] paths)
    => paths != null && paths.Length > 0 && paths.All(p => AssetDatabase.IsValidFolder(p.TrimEnd('/')));

try
{
    await generator.Generate();
}
catch (ArgumentException ex) when (ex.Message.Contains("not a valid ADB folder"))
{
    Debug.LogError($"Invalid input folder: {ex.Message}. Use paths relative to the project (e.g., 'Assets/MyFolder').");
}

When it happens

Trigger: Iterating Settings.InputPaths in ValidateSettings: for each path, a trailing slash is removed, then AssetDatabase.IsValidFolder(inputPath) returns false.

Common situations: Path points to a folder outside the Unity project (e.g., an absolute system path); folder was deleted or moved after being selected; folder exists on disk but hasn't been imported by Unity yet; path has a typo or uses backslashes on Windows; folder is inside the project but under a .gitignore'd or hidden directory.

Related errors

• Input path cannot be null
• Output path cannot be null
• Package Exporting failed: provided export paths are empty or
• Width should be larger than 0
• Height should be larger than 0

AI-assisted analysis of CoplayDev/unity-mcp@c21bf496bc (2026-08-13). Data as JSON: /api/errors/d2f05cd1994c72a7. Report an issue: GitHub.