{"record":{"id":"daa69e0aa236d9fc","repo":"bevyengine/bevy","slug":"attempted-to-load-type-0-which-does-not-have-reflectasset-in","errorCode":null,"errorMessage":"Attempted to load type \"{0}\", which does not have `ReflectAsset` in the type registry. Make sure to add `#[reflect(Asset)]` to your type","messagePattern":"Attempted to load type \"(.+?)\", which does not have `ReflectAsset` in the type registry\\. Make sure to add `#\\[reflect\\(Asset\\)\\]` to your type","errorType":"exception","errorClass":"ReflectedRonDeserializeError::MissingReflectAsset","httpStatus":null,"severity":"error","filePath":"crates/bevy_asset/src/common_loaders/ron.rs","lineNumber":459,"sourceCode":"}\n\n/// An error type for RON loading.\n#[derive(Error, Debug)]\npub enum RonDeserializeError {\n    #[error(transparent)]\n    IoError(#[from] std::io::Error),\n    #[error(transparent)]\n    RonSpan(#[from] ron::de::SpannedError),\n}\n\n/// An error type for RON loading using reflection.\n#[derive(Error, Debug)]\npub enum ReflectedRonDeserializeError {\n    #[error(transparent)]\n    Ron(#[from] RonDeserializeError),\n    #[error(\"Attempted to load type \\\"{0}\\\", which does not have `ReflectFromReflect` in the type registry. This may occur for types that have opted-out of `FromReflect`\")]\n    MissingReflectFromReflect(&'static str),\n    #[error(\"Attempted to load type \\\"{0}\\\", which does not have `ReflectAsset` in the type registry. Make sure to add `#[reflect(Asset)]` to your type\")]\n    MissingReflectAsset(&'static str),\n}\n\n/// An error type for RON saving.\n#[derive(Error, Debug)]\npub enum RonSerializeError {\n    #[error(transparent)]\n    IoError(#[from] std::io::Error),\n    #[error(transparent)]\n    Ron(#[from] ron::Error),\n}\n\n/// An error type for RON saving using reflection.\n#[derive(Error, Debug)]\npub enum ReflectedRonSerializeError {\n    #[error(\n        \"Expected the root LoadedUntypedHandle to hold a handle to its subasset, but it did not have such a subasset\"\n    )]","sourceCodeStart":441,"sourceCodeEnd":477,"githubUrl":"https://github.com/bevyengine/bevy/blob/a62cce8c05ceacd3bd102e678c83e2b42e5dfbe2/crates/bevy_asset/src/common_loaders/ron.rs#L441-L477","documentation":"ReflectedRonDeserializeError::MissingReflectAsset is thrown when a RON asset contains a handle to an asset (e.g. #asset(...) or an Id) but the referenced type lacks ReflectAsset in the TypeRegistry. ReflectAsset is the type data that lets reflection resolve and load asset handles.","triggerScenarios":"Loading a .ron file that references a Bevy asset handle for type T where T implements Asset and Reflect but was never annotated #[reflect(Asset)] / registered with ReflectAsset type data.","commonSituations":"A struct field of type Handle<T> or AssetId<T> in a RON asset where the plugin for T didn't register the asset reflection; custom asset types missing #[reflect(Asset)].","solutions":["Add #[reflect(Asset)] to the type's derive attribute: #[derive(Asset, Reflect)] #[reflect(Asset)]","Register the type: app.register_type::<T>() after adding the reflect(Asset) attribute","Ensure the asset's plugin (e.g. via bevy_asset add_asset) is loaded before the RON asset loads"],"exampleFix":"// before\n#[derive(Asset, Reflect)]\nstruct MyMaterial { color: Color }\n\n// after\n#[derive(Asset, Reflect)]\n#[reflect(Asset)]\nstruct MyMaterial { color: Color }","handlingStrategy":"validation","validationCode":"fn has_reflect_asset<T: Asset + GetTypeRegistration>(app: &App) -> bool {\n    let reg = app.world().resource::<AppTypeRegistry>().0.read();\n    reg.get(TypeId::of::<T>()).map_or(false, |r| r.data::<ReflectAsset>().is_some())\n}","typeGuard":"fn has_reflect_asset(registry: &TypeRegistry, ty: TypeId) -> bool {\n    registry.get(ty).map_or(false, |r| r.data::<ReflectAsset>().is_some())\n}","tryCatchPattern":null,"preventionTips":["Always add #[reflect(Asset)] to custom asset types","Register asset types before asset loads are triggered","Keep the type registration inside the asset's plugin"],"tags":["bevy","assets","reflection","ron"],"backgroundTag":"missing-type-registration","analyzedSha":"a62cce8c05ceacd3bd102e678c83e2b42e5dfbe2","analyzedAt":"2026-09-19T21:23:06.616Z","contentChangedAt":"2026-09-19T21:23:06.616Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}