{"record":{"id":"0c09794b4872413f","repo":"bevyengine/bevy","slug":"subasset-type-was-not-registered-in-the-typeregistry-ensure","errorCode":null,"errorMessage":"Subasset type was not registered in the TypeRegistry. Ensure your subasset's type implements Reflect (and if it's generic it needs to be manually registered)","messagePattern":"Subasset type was not registered in the TypeRegistry\\. Ensure your subasset's type implements Reflect \\(and if it's generic it needs to be manually registered\\)","errorType":"exception","errorClass":"ReflectedRonSerializeError::ValueNotReflect","httpStatus":null,"severity":"error","filePath":"crates/bevy_asset/src/common_loaders/ron.rs","lineNumber":479,"sourceCode":"}\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    )]\n    MissingSubasset,\n    #[error(\"Subasset type was not registered in the TypeRegistry. Ensure your subasset's type implements Reflect (and if it's generic it needs to be manually registered)\")]\n    ValueNotReflect,\n    #[error(\"Subasset type does not have ReflectFromPtr registered in its type data\")]\n    MissingReflectFromPtr,\n    #[error(transparent)]\n    Ron(#[from] RonSerializeError),\n}\n\n#[cfg(test)]\nmod tests {\n    use std::path::Path;\n\n    use alloc::{string::String, vec};\n\n    use bevy_ecs::reflect::AppTypeRegistry;\n    use bevy_reflect::{Reflect, TypePath};\n    use bevy_tasks::{futures::check_ready, IoTaskPool};\n    use serde::{Deserialize, Serialize};\n","sourceCodeStart":461,"sourceCodeEnd":497,"githubUrl":"https://github.com/bevyengine/bevy/blob/a62cce8c05ceacd3bd102e678c83e2b42e5dfbe2/crates/bevy_asset/src/common_loaders/ron.rs#L461-L497","documentation":"ReflectedRonSerializeError::ValueNotReflect is thrown when the subasset value's type was not found in the TypeRegistry during reflected RON serialization. The serializer looks up the value's type to obtain reflection data (ReflectSerialize etc.) needed to write it out.","triggerScenarios":"Saving a RON asset whose concrete subasset type implements Reflect but was never passed to app.register_type::<T>(); generic types like Vec<MyType> or HashMap<K, V> that need manual registration.","commonSituations":"Generic or newtype-wrapped assets not registered; type registered only in a plugin that isn't active in this app; registering the root type but forgetting nested/container types.","solutions":["Call app.register_type::<T>() for the subasset's concrete type","For generic types, register the monomorphized instance manually (e.g. app.register_type::<Vec<MyType>>())","Ensure the plugin that registers the type runs before the save occurs"],"exampleFix":"// before\napp.save_asset(&handle, \"level.ron\");\n\n// after\napp.register_type::<LevelConfig>();\napp.save_asset(&handle, \"level.ron\");","handlingStrategy":"validation","validationCode":"fn is_type_registered<T: GetTypeRegistration>(registry: &TypeRegistry) -> bool {\n    registry.contains(TypeId::of::<T>())\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Register all monomorphized generic types used in assets","Verify registration in tests with registry.contains"],"tags":["bevy","assets","reflection","serialization"],"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"}