{"record":{"id":"daa804d3508c2512","repo":"stride3d/stride","slug":"the-type-type-name-does-not-have-a-public-parameterless","errorCode":null,"errorMessage":"The type {type.Name} does not have a public parameterless constructor.)","messagePattern":"The type (.+?) does not have a public parameterless constructor\\.\\)","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"sources/assets/Stride.Core.Assets.Quantum/AssetQuantumRegistry.cs","lineNumber":68,"sourceCode":"\n                if (type.GetConstructor(AssetPropertyNodeGraphConstructorSignature) is null)\n                    throw new InvalidOperationException($\"The type {type.Name} does not have a public constructor matching the expected signature: ({string.Join(\", \", (IEnumerable<Type>)AssetPropertyNodeGraphConstructorSignature)})\");\n\n                if (!NodeGraphTypes.TryAdd(attribute.AssetType, type))\n                    throw new ArgumentException($\"The type {attribute.AssetType.Name} already has an associated property node graph type.\");\n            }\n        }\n\n        if (scanTypes.Types.TryGetValue(typeof(AssetPropertyGraphDefinitionAttribute), out var definitionTypes))\n        {\n            foreach (var type in definitionTypes)\n            {\n                var attribute = type.GetCustomAttribute<AssetPropertyGraphDefinitionAttribute>();\n                if (attribute is null)\n                    continue;\n\n                if (type.GetConstructor(Type.EmptyTypes) is null)\n                    throw new InvalidOperationException($\"The type {type.Name} does not have a public parameterless constructor.)\");\n\n                if (NodeGraphDefinitions.ContainsKey(attribute.AssetType))\n                    throw new ArgumentException($\"The type {attribute.AssetType.Name} already has an associated property node graph type.\");\n\n                if (attribute.AssetType.IsGenericTypeDefinition && type.IsGenericType)\n                {\n                    // If the asset type is generic (usually a base class of other asset types), we cannot create instances yet.\n                    // So we just store the generic type definition in another dictionary.\n                    GenericNodeGraphDefinitionTypes.Add(attribute.AssetType, type.GetGenericTypeDefinition());\n                }\n                else\n                {\n                    // Normal case, we create an instance of the definition immediately.\n                    var definition = (AssetPropertyGraphDefinition)Activator.CreateInstance(type)!;\n                    NodeGraphDefinitions.Add(attribute.AssetType, definition);\n                }\n            }\n        }","sourceCodeStart":50,"sourceCodeEnd":86,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/assets/Stride.Core.Assets.Quantum/AssetQuantumRegistry.cs#L50-L86","documentation":"Registration-time validation in AssetQuantumRegistry.RegisterAssembly for graph-definition types: a type marked with AssetPropertyGraphDefinitionAttribute does not expose a public parameterless constructor, which the registry requires to instantiate the definition on demand.","triggerScenarios":"Thrown at sources/assets/Stride.Core.Assets.Quantum/AssetQuantumRegistry.cs:68 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Add a public parameterless constructor to the graph definition class","Remove constructor parameters/dependencies that prevent a default instantiation"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}