Unity-Technologies/UnityCsReference · critical · FileNotFoundException

No {prefix}*{suffix} package found in {sdkNugetsPath}

Error message

No {prefix}*{suffix} package found in {sdkNugetsPath}

What it means

Thrown by GetUnitySdkVersion (UnityEditorMSBuildPropsTargetsGeneration.cs:252, FileNotFoundException) when the SDK nuget feed directory exists but contains no file matching the Unity.Sdk.*.nupkg pattern. Files ending in .symbols.nupkg are skipped, and candidates whose extracted version does not start with a digit are ignored. If no qualifying package remains, the version cannot be determined and global.json cannot be generated.

Source

Thrown at Editor/Mono/Scripting/ScriptCompilation/MsBuild/UnityEditorMSBuildPropsTargetsGeneration.cs:252

        if (!Directory.Exists(sdkNugetsPath))
            throw new DirectoryNotFoundException($"Unity SDK nuget feed not found at {sdkNugetsPath}");

        foreach (var file in Directory.EnumerateFiles(sdkNugetsPath, $"{prefix}*{suffix}"))
        {
            var name = Path.GetFileName(file);
            if (name.EndsWith(".symbols.nupkg", StringComparison.OrdinalIgnoreCase))
                continue;

            var candidate = name.Substring(prefix.Length, name.Length - prefix.Length - suffix.Length);
            if (candidate.Length == 0 || !char.IsDigit(candidate[0]))
                continue;

            s_cachedUnitySdkVersion = candidate;
            return candidate;
        }

        throw new FileNotFoundException($"No {prefix}*{suffix} package found in {sdkNugetsPath}");
    }

    private static string s_cachedDotnetRuntimeVersion;

    // The .NET SDK version written to the generated global.json (sdk.version) must match the .NET SDK
    // Unity ships. Read it from the SDK's authoritative ".version" metadata (the version is on the
    // second line) rather than trusting the folder name, so a .NET upgrade (8 -> 10 -> ...) needs no
    // change here. We return the full version (e.g. "10.0.102"), preserving minor/patch, and pick the
    // highest if more than one SDK is present.
    private static string GetDotnetRuntimeVersion()
    {
        if (s_cachedDotnetRuntimeVersion != null)
            return s_cachedDotnetRuntimeVersion;

        var sdkRoot = Path.Combine(EditorApplication.applicationScriptingPath, "DotNetSdk", "sdk");
        if (!Directory.Exists(sdkRoot))
            throw new DirectoryNotFoundException($"Bundled dotnet SDK not found at {sdkRoot}");

View on GitHub (pinned to 225b0fbdb5)

Solutions

1. Reinstall/repair the Unity Editor to restore the Unity.Sdk.<version>.nupkg in the bundled feed.
2. Ensure the package file is named 'Unity.Sdk.<digit-starting-version>.nupkg' (not only a .symbols.nupkg) and was not quarantined by antivirus.

const string prefix = "Unity.Sdk.", suffix = ".nupkg";
var pkg = Directory.EnumerateFiles(sdkNugetsPath, $"{prefix}*{suffix}")
    .FirstOrDefault(f => !f.EndsWith(".symbols.nupkg", StringComparison.OrdinalIgnoreCase)
                          && char.IsDigit(Path.GetFileName(f)
                              .Substring(prefix.Length)[0]));
if (pkg == null)
    throw new FileNotFoundException(
        $"Unity.Sdk.*.nupkg not found in {sdkNugetsPath}; repair the editor install.");

When it happens

Trigger: The feed directory is present but the Unity.Sdk package is missing, only symbol packages remain, or all candidate package names fail the 'starts with a digit' version check.

Common situations: Partial install where the main package was deleted but symbols remain. A repackaged/corrupt SDK feed. A manually modified feed folder.

Related errors

• Unity SDK nuget feed not found at {sdkNugetsPath}
• Bundled dotnet SDK not found at {sdkRoot}
• No SDK with a valid .version file found under {sdkRoot}
• Unsupported architecture {RuntimeInformation.ProcessArchitec
• Unsupported architecture {RuntimeInformation.ProcessArchitec

AI-assisted analysis of Unity-Technologies/UnityCsReference@225b0fbdb5 (2026-08-13). Data as JSON: /api/errors/846fe772bd8ad410. Report an issue: GitHub.