{"record":{"id":"2603d6dad9bd25b2","repo":"bevyengine/bevy","slug":"no-componentid-corresponding-to-0-found-did","errorCode":null,"errorMessage":"No `ComponentId` corresponding to {0:?} found (did you call App::register_type()?)","messagePattern":"No `ComponentId` corresponding to (.+?) found \\(did you call App::register_type\\(\\)\\?\\)","errorType":"exception","errorClass":"GetComponentReflectError::NoCorrespondingComponentId","httpStatus":null,"severity":"error","filePath":"crates/bevy_ecs/src/world/reflect.rs","lineNumber":221,"sourceCode":"            self.entity_mut(entity).insert_reflect(reflected_resource);\n        } else {\n            self.spawn_empty().insert_reflect(reflected_resource);\n        }\n    }\n}\n\n/// The error type returned by [`World::get_reflect`] and [`World::get_reflect_mut`].\n#[derive(Error, Debug)]\npub enum GetComponentReflectError {\n    /// There is no [`ComponentId`] corresponding to the given [`TypeId`].\n    ///\n    /// This is usually handled by calling [`App::register_type`] for the type corresponding to\n    /// the given [`TypeId`].\n    ///\n    /// See the documentation for [`bevy_reflect`] for more information.\n    ///\n    /// [`App::register_type`]: ../../../bevy_app/struct.App.html#method.register_type\n    #[error(\"No `ComponentId` corresponding to {0:?} found (did you call App::register_type()?)\")]\n    NoCorrespondingComponentId(TypeId),\n\n    /// The given [`Entity`] does not have a [`Component`] corresponding to the given [`TypeId`].\n    #[error(\"The given `Entity` {entity} does not have a `{component_name:?}` component ({component_id:?}, which corresponds to {type_id:?})\")]\n    EntityDoesNotHaveComponent {\n        /// The given [`Entity`].\n        entity: Entity,\n        /// The given [`TypeId`].\n        type_id: TypeId,\n        /// The [`ComponentId`] corresponding to the given [`TypeId`].\n        component_id: ComponentId,\n        /// The name corresponding to the [`Component`] with the given [`TypeId`], or `None`\n        /// if not available.\n        component_name: Option<DebugName>,\n    },\n\n    /// The [`World`] was missing the [`AppTypeRegistry`] resource.\n    #[error(\"The `World` was missing the `AppTypeRegistry` resource\")]","sourceCodeStart":203,"sourceCodeEnd":239,"githubUrl":"https://github.com/bevyengine/bevy/blob/396ca727080776bd313bb892423b7d94e03b81b4/crates/bevy_ecs/src/world/reflect.rs#L203-L239","documentation":"GetComponentReflectError::NoCorrespondingComponentId is returned by World::get_reflect / get_reflect_mut when you pass a TypeId for which this World has no registered ComponentId. Reflection-based access needs the type both registered in the type registry and known to the ECS as a component; if the component type was never registered (typically via App::register_type::<T>() plus the component actually being known to the world), the lookup fails with this error.","triggerScenarios":"Calling world.get_reflect(entity, TypeId::of::<T>()) (or get_reflect_mut) where T was never passed to app.register_type::<T>(); using a TypeId obtained from reflected data for a component type this World has never seen (fresh test World, sub-world); deserializing/editor tooling that resolves components purely by TypeId before the game registered them.","commonSituations":"Scene/level editors and hot-loading code that fetch components reflectively; forgetting #[derive(Reflect)] + register_type for a component inspected by generic tooling; running reflective helpers in unit tests on a bare World without the app's registration pass.","solutions":["Register the type before reflective access: app.register_type::<T>(); in plugin build, or world.init_type_registry + registration equivalent.","If on a bare World, mirror what App does: insert AppTypeRegistry and register the component types you will access reflectively.","Check world.get_component_id(TypeId::of::<T>()) first and degrade gracefully (skip or log) when it returns None.","Make sure T actually derives/implements Reflect and is used as a Component somewhere or explicitly registered."],"exampleFix":"// before\nlet comp = world.get_reflect(entity, TypeId::of::<Health>())?; // NoCorrespondingComponentId\n\n// after\napp.register_type::<Health>();\n// guard anyway:\nlet Some(id) = world.get_component_id(TypeId::of::<Health>()) else {\n    return Ok(());\n};\nlet comp = world.get_reflect(entity, TypeId::of::<Health>())?;","handlingStrategy":"validation","validationCode":"let type_id = TypeId::of::<T>();\nif world.get_component_id(type_id).is_none() {\n    app.register_type::<T>(); // or skip reflective access\n}","typeGuard":null,"tryCatchPattern":"match world.get_reflect(entity, TypeId::of::<T>()) {\n    Ok(v) => { /* ... */ }\n    Err(GetComponentReflectError::NoCorrespondingComponentId(id)) => {\n        debug!(\"component type not registered: {id:?}\");\n    }\n    Err(e) => { /* ... */ }\n}","preventionTips":["Centralize register_type calls in plugin build() for every reflected component.","Derive Reflect on all components touched by editors/serializers.","Treat get_component_id(...) == None as 'not registered' and register or skip before get_reflect."],"tags":["bevy","ecs","reflect","type-registry","register-type","component-id"],"backgroundTag":"type-not-registered","analyzedSha":"396ca727080776bd313bb892423b7d94e03b81b4","analyzedAt":"2026-08-20T16:12:39.808Z","contentChangedAt":"2026-08-20T16:12:39.808Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}