{"record":{"id":"e6237dafe3b85eda","repo":"stride3d/stride","slug":"unable-to-create-an-instance-of-definition-type","errorCode":null,"errorMessage":"Unable to create an instance of definition type {definitionGenericDefinitionType.Name} for asset type {currentType.Name}.","messagePattern":"Unable to create an instance of definition type (.+?) for asset type (.+?)\\.","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"sources/assets/Stride.Core.Assets.Quantum/AssetQuantumRegistry.cs","lineNumber":139,"sourceCode":"            }\n\n            if (currentType.IsGenericType)\n            {\n                // If we reach a generic type, we must check if we have a matching generic definition and if so, create a proper instance of this generic type.\n                var assetGenericDefinitionType = currentType.GetGenericTypeDefinition();\n                if (GenericNodeGraphDefinitionTypes.TryGetValue(assetGenericDefinitionType, out var definitionGenericDefinitionType))\n                {\n                    try\n                    {\n                        var definitionType = definitionGenericDefinitionType.MakeGenericType(currentType.GetGenericArguments());\n                        definition = (AssetPropertyGraphDefinition)Activator.CreateInstance(definitionType)!;\n                        // Register the (new) instance for this specific type so we don't have to do this again next time.\n                        NodeGraphDefinitions.Add(assetType, definition);\n                        return definition;\n                    }\n                    catch (Exception)\n                    {\n                        throw new InvalidOperationException($\"Unable to create an instance of definition type {definitionGenericDefinitionType.Name} for asset type {currentType.Name}.\");\n                    }\n                }\n            }\n\n            currentType = currentType.BaseType;\n        }\n\n        return NodeGraphDefinitions[typeof(Asset)];\n    }\n}\n","sourceCodeStart":121,"sourceCodeEnd":150,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/assets/Stride.Core.Assets.Quantum/AssetQuantumRegistry.cs#L121-L150","documentation":"GetDefinition found a matching generic definition type for a generic asset type, but Activator/MakeGenericType instantiation of the closed definition type threw (e.g. missing constructor or type-constraint violation). The inner exception carries the real cause; the message identifies the definition and asset types involved.","triggerScenarios":"Thrown at sources/assets/Stride.Core.Assets.Quantum/AssetQuantumRegistry.cs:139 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Ensure the generic definition type has a public parameterless constructor usable after MakeGenericType","Check that the generic parameters satisfy the definition type's constraints","Catch and inspect the inner exception to identify the failing instantiation step"],"exampleFix":null,"handlingStrategy":"try-catch","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"}