{"record":{"id":"eb563365dcec02a0","repo":"stride3d/stride","slug":"could-not-find-a-valid-content-serializer-for-typeof-t-when","errorCode":null,"errorMessage":"Could not find a valid content serializer for {typeof(T)} when loading {contentReference.Location}","messagePattern":"Could not find a valid content serializer for (.+?) when loading (.+?)","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"sources/core/Stride.Core.Serialization/Serialization/Contents/ReferenceSerializer.cs","lineNumber":61,"sourceCode":"                    // Check if already deserialized\n                    var assetReference = contentSerializerContext.ContentManager.FindDeserializedObject(contentReference.Location, typeof(T));\n                    if (assetReference != null)\n                    {\n                        obj = (T)assetReference.Object;\n                        if (obj != null)\n                            contentReference.Value = obj;\n                    }\n                }\n\n                if (obj == null && contentSerializerContext.LoadContentReferences)\n                {\n                    var contentSerializer = cachedContentSerializer ??= contentSerializerContext.ContentManager.Serializer.GetSerializer(null, typeof(T));\n                    if (contentSerializer == null)\n                    {\n                        // Need to read chunk header to know actual type (note that we can't cache it in cachedContentSerializer as it depends on content)\n                        var chunkHeader = contentSerializerContext.ContentManager.ReadChunkHeader(contentReference.Location);\n                        if (chunkHeader == null || (contentSerializer = contentSerializerContext.ContentManager.Serializer.GetSerializer(AssemblyRegistry.GetType(chunkHeader.Type), typeof(T))) == null)\n                            throw new InvalidOperationException($\"Could not find a valid content serializer for {typeof(T)} when loading {contentReference.Location}\");\n                    }\n\n                    // First time, let's create it\n                    if (contentSerializerContext.ContentManager.Exists(contentReference.Location))\n                    {\n                        obj = (T)contentSerializer.Construct(contentSerializerContext);\n                        contentSerializerContext.ContentManager.RegisterDeserializedObject(contentReference.Location, obj);\n                        contentReference.Value = obj;\n                    }\n                }\n            }\n        }\n        else if (referenceSerialization == ContentSerializerContext.AttachedReferenceSerialization.AsNull)\n        {\n            if (mode == ArchiveMode.Deserialize)\n            {\n                obj = default;\n            }","sourceCodeStart":43,"sourceCodeEnd":79,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/core/Stride.Core.Serialization/Serialization/Contents/ReferenceSerializer.cs#L43-L79","documentation":"ReferenceSerializer<T>.Serialize resolves a content serializer for T when serializing a content reference. If neither the cached serializer nor the one derived from the stored chunk header type can be resolved, the library cannot construct or serialize the referenced content and throws.","triggerScenarios":"Serializing/deserializing a content reference whose Location points to content of a type with no registered serializer, or whose chunk header type fails AssemblyRegistry.GetType resolution (assembly not loaded or removed).","commonSituations":"Loading assets built with types from an assembly no longer referenced; a plugin/asset type removed in a version upgrade; corrupt or hand-edited asset files with unknown chunk types.","solutions":["Ensure the assembly containing the referenced content type is loaded (AssemblyRegistry) before deserialization","Register a serializer for the concrete content type of the asset","Rebuild/re-save the asset so its chunk header matches a currently registered type","Verify the contentReference.Location points to the intended asset of a serializable type"],"exampleFix":"// before\n// plugin assembly with MyAssetType never loaded\nvar asset = contentManager.Load<MyAssetType>(\"my-asset\"); // throws\n// after\nAssemblyRegistry.Register(typeof(MyAssetType).Assembly);\nvar asset = contentManager.Load<MyAssetType>(\"my-asset\");","handlingStrategy":"try-catch","validationCode":"if (AssemblyRegistry.GetType(chunkType) == null)\n    throw new InvalidOperationException(\"Assembly for asset type not loaded\");","typeGuard":null,"tryCatchPattern":"try { var asset = contentManager.Load<T>(location); }\ncatch (InvalidOperationException ex) when (ex.Message.Contains(\"valid content serializer\")) { // ensure assembly/serializer registered\n}","preventionTips":["Keep plugin/content assemblies referenced by the app","Re-save assets after type renames or assembly moves","Register content serializers at startup before loading assets"],"tags":["serialization","assets","missing-serializer"],"backgroundTag":"resource-not-found","analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}