stride3d/stride · error · InvalidOperationException

cannot be .

Error message

{nameof(sceneId)} cannot be {nameof(Guid.Empty)}.

What it means

SceneEditorGame.AddScene rejects a sceneId equal to Guid.Empty with an InvalidOperationException. A scene must have a real identifier because it is keyed in the internal scenes dictionary and referenced by parent/child links.

Solutions

1. Generate a valid id with Guid.NewGuid() before calling AddScene.
2. Load the actual scene identifier from the asset instead of passing a default Guid.
3. Skip or log scenes with empty ids instead of adding them.

Example fix

// before
sceneEditorGame.AddScene(Guid.Empty, parentId);
// after
sceneEditorGame.AddScene(Guid.NewGuid(), parentId);

if (sceneId == Guid.Empty) throw new ArgumentException("sceneId must be a valid Guid", nameof(sceneId));

bool IsValidSceneId(Guid id) => id != Guid.Empty;

try { game.AddScene(sceneId, parentId); } catch (InvalidOperationException ex) when (ex.Message.Contains("Guid.Empty")) { sceneId = Guid.NewGuid(); game.AddScene(sceneId, parentId); }

When it happens

Trigger: Calling AddScene(Guid.Empty, parentId), typically when a scene id was never assigned (default(Guid) passed by mistake).

Common situations: Generating scenes in a loop with an uninitialized Guid variable; deserializing scene data where ids were missing and defaulted to Guid.Empty.

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

• The given does not correspond to any existing part.
• The given does not correspond to any existing part.
• A scene matching the given
• Scenes with child scenes cannot be removed.
• Scenes with entities cannot be removed.

AI-assisted analysis of stride3d/stride@96fad776d2 (2026-09-14). Data as JSON: /api/errors/43f1c46e1ad2ab40. Report an issue: GitHub.

Appendix: source

Thrown at sources/editor/Stride.Assets.Presentation/AssetEditors/SceneEditor/Game/SceneEditorGame.cs:39

        private readonly Dictionary<Guid, Scene> scenes = new Dictionary<Guid, Scene>();

        public SceneEditorGame(TaskCompletionSource<bool> gameContentLoadedTaskSource, IEffectCompiler effectCompiler, string effectLogPath)
            : base(gameContentLoadedTaskSource, effectCompiler, effectLogPath)
        {

        }

        public event Action<Scene> SceneAdded;
        public event Action<Scene> SceneRemoved;

        /// <summary>
        /// Adds a new scene with the provided <paramref name="sceneId"/>.
        /// </summary>
        /// <param name="sceneId">The identifier of the scene to add.</param>
        /// <param name="parentId">The identifier of an existing parent scene, or <see cref="Guid.Empty"/>.</param>
        public void AddScene(Guid sceneId, Guid parentId)
        {
            if (sceneId == Guid.Empty) throw new InvalidOperationException($"{nameof(sceneId)} cannot be {nameof(Guid.Empty)}.");
            if (scenes.ContainsKey(sceneId)) throw new InvalidOperationException($"A scene matching the given {sceneId}, already exists.");

            EnsureContentScene();

            var scene = new Scene { Id = sceneId };
            var parent = parentId != Guid.Empty ? GetScene(parentId) : ContentScene;
            AddSceneToParent(scene, parent);
            scenes.Add(sceneId, scene);
            SceneAdded?.Invoke(scene);
        }

        /// <summary>
        /// Moves an existing scene identified by <paramref name="sceneId"/> under the parent scene identified by <paramref name="parentId"/>.
        /// </summary>
        /// <param name="sceneId">The identifier of the scene to move.</param>
        /// <param name="parentId">The identifier of an existing parent scene, or <see cref="Guid.Empty"/>.</param>
        public void MoveScene(Guid sceneId, Guid parentId)
        {

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