FyroxEngine/Fyrox · critical

Unable to get a resource of type

Error message

Unable to get a resource of type {needed_type_uuid} from resource UUID {}! The resource is loaded but its actual data has type {type_uuid}!

What it means

ResourceManager::request_resource<T>(uuid) fetches a resource by UUID and, once it is loaded, verifies the data's type UUID equals T's. If the resource loaded as a different type the manager panics with both UUIDs, since the typed handle T would be invalid.

Solutions

1. Request with the type matching the reported type_uuid in the panic message.
2. Fix the UUID or re-import/re-save the asset so it maps to a resource of type T.
3. Load untyped first and branch on the actual type_uuid before downcasting.
4. Check the loading path (from_file/build_from_memory) isn't associating the UUID with the wrong file/content.

Example fix

// before
let tex: Texture = rm.request_resource(uuid)?; // uuid loads a Model
// after
let model: Model = rm.request_resource(uuid)?;

let untyped = resource_manager.state().find_uuid(uuid);
let ok = untyped.type_uuid_non_blocking()
    .map_or(true, |t| t == <T as Reflect>::type_info().type_uuid);
if ok { let r: T = resource_manager.request_resource(uuid).unwrap(); }

When it happens

Trigger: Calling request_resource::<T>(uuid) (or the from_file/build_from_memory paths that call it) where the resource stored under that UUID loads to a data type whose UUID differs from T.

Common situations: Same UUID used for different asset types across save files; scenes saved with one asset type then the asset replaced by another type; mismatched generic parameters in generated asset-import code.

Understand the failure class

Background: Type mismatch errors: IllegalArgumentException, TypeError and type guards across 150 open-source libraries — this error's family across 150 libraries.

Related errors

• Unable to get a resource of type
• Unable to get a resource of type
• Unable to add a resource of type
• Cast to failed!
• Height data type error

AI-assisted analysis of FyroxEngine/Fyrox@76c91aad8e (2026-09-10). Data as JSON: /api/errors/74735a4b6976ca30. Report an issue: GitHub.

Appendix: source

Thrown at fyrox-resource/src/manager.rs:677

    /// is already loaded, then you can use [`Resource::data_ref`] to obtain a reference to the actual resource data.
    /// Keep in mind, that this method will panic if the resource non in `Ok` state.
    ///
    /// ## Panic
    ///
    /// This method will panic, if type UUID of `T` does not match the actual type UUID of the resource. If this
    /// is undesirable, use [`Self::try_request`] instead.
    pub fn request_resource<T>(&self, resource: &mut Resource<T>)
    where
        T: TypedResourceData,
    {
        let mut state = self.state();

        state.request_resource(&mut resource.untyped);

        if let Some(type_uuid) = resource.untyped.type_uuid_non_blocking() {
            let needed_type_uuid = <T as Reflect>::type_info().type_uuid;
            if type_uuid != needed_type_uuid {
                panic!(
                    "Unable to get a resource of type {needed_type_uuid} from resource UUID {}! The resource is \
                    loaded but its actual data has type {type_uuid}!",
                    resource.resource_uuid(),
                );
            }
        }
    }

    /// Add the given resource to the resource manager, based on the resource's UUID,
    /// without initiating the loading of the resource. The given resource is modified
    /// to be a reference to the shared data of an existing resource with the same UUID.
    pub fn add_resource<T>(&self, resource: &mut Resource<T>)
    where
        T: TypedResourceData,
    {
        let mut state = self.state();

        state.add_resource(&mut resource.untyped);

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