{"record":{"id":"7b864e1d99ad5661","repo":"stride3d/stride","slug":"unable-to-find-a-serializer-for-assetfileextension","errorCode":null,"errorMessage":"Unable to find a serializer for [{assetFileExtension}]","messagePattern":"Unable to find a serializer for \\[(.+?)\\]","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"sources/assets/Stride.Core.Assets/AssetFileSerializer.cs","lineNumber":152,"sourceCode":"    /// </summary>\n    /// <param name=\"stream\">The stream.</param>\n    /// <param name=\"asset\">The asset object.</param>\n    /// <param name=\"yamlMetadata\"></param>\n    /// <param name=\"log\">The logger.</param>\n    /// <exception cref=\"System.ArgumentNullException\">\n    /// stream\n    /// or\n    /// assetFileExtension\n    /// </exception>\n    public static void Save(Stream stream, object asset, AttachedYamlAssetMetadata? yamlMetadata, ILogger? log = null, string? assetNamespace = null)\n    {\n        ArgumentNullException.ThrowIfNull(stream);\n        if (asset == null) return;\n\n        var assetFileExtension = AssetRegistry.GetDefaultExtension(asset.GetType())\n            ?? throw new ArgumentException(\"Unable to find a serializer for the specified asset. No asset file extension registered to AssetRegistry\");\n        var serializer = FindSerializer(assetFileExtension)\n            ?? throw new InvalidOperationException($\"Unable to find a serializer for [{assetFileExtension}]\");\n        serializer.Save(stream, asset, yamlMetadata, log, assetNamespace);\n    }\n}\n","sourceCodeStart":134,"sourceCodeEnd":156,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/assets/Stride.Core.Assets/AssetFileSerializer.cs#L134-L156","documentation":"After resolving the asset's default extension from AssetRegistry, Save could not find a serializer registered for that specific extension. The type is registered but the (extension -> serializer) mapping is missing at save time.","triggerScenarios":"Calling AssetFileSerializer.Save where AssetRegistry.GetDefaultExtension(type) returns an extension (e.g. from a stale/duplicate registration) but no IAssetSerializer was registered for that extension string; registration order issues where serializers are registered after save runs.","commonSituations":"Custom asset pipeline where extension registration and serializer registration got out of sync; serializers assembly not loaded; casing/leading-dot mismatch between registered extension and serializer keys.","solutions":["Register an IAssetSerializer for the exact extension returned by GetDefaultExtension (including leading dot/casing)","Ensure serializer registration code runs before the first Save call","Compare the extension string used in both registrations for exact match (ToLowerInvariant applies on load path only)","Check that the serializer assembly is referenced and initialized in this process"],"exampleFix":"// before\n// extension registered, but no serializer for '.myasset'\nAssetFileSerializer.Save(stream, myAsset);\n// after\nSerializerRegistry.Register(new MyAssetSerializer(\"myasset\")); // must match '.myasset'\nAssetFileSerializer.Save(stream, myAsset);","handlingStrategy":"validation","validationCode":"var ext = AssetRegistry.GetDefaultExtension(asset.GetType());\nif (ext != null && AssetFileSerializer.FindSerializer(ext) == null)\n    throw new InvalidOperationException($\"No serializer registered for '{ext}'\");","typeGuard":null,"tryCatchPattern":"try { AssetFileSerializer.Save(stream, asset, yamlMetadata, log); }\ncatch (InvalidOperationException ex) when (ex.Message.StartsWith(\"Unable to find a serializer\"))\n{ log.Error($\"Serializer missing for extension of {asset.GetType()}\"); }","preventionTips":["Register serializer and extension mapping together in one init method","Ensure serializer registration runs before first save (module load order)","Compare extension strings for exact match including the leading dot"],"tags":["serialization","missing-serializer","asset-registry"],"backgroundTag":"missing-dependency","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"}