FyroxEngine/Fyrox · error

Attempt to get reference to resource data which failed to…

Error message

Attempt to get reference to resource data which failed to load! Type {}. Path: {path}. Error: {error:?}

What it means

Deref on Resource<T> panics when the resource is in the LoadError state: the load failed, so there is no data to hand out. The panic includes the resource type, the (possibly 'Unknown') path, and the underlying error for diagnosis.

Solutions

1. Read the embedded path and error from the panic/state and fix the asset (correct path, valid format).
2. Check state() for LoadError before dereferencing and handle the failure (fallback asset, error UI, skip).
3. Inspect the ResourceState::LoadError { path, error } fields programmatically to log a precise diagnosis instead of crashing.

Example fix

// before
let tex = rm.request::<Texture>(path)?;
let data = tex.data_ref(); // panics if load failed
// after
let tex = rm.request::<Texture>(path)?;
if let ResourceState::LoadError { error, .. } = &*tex.state() {
    Log::writeln(MessageKind::Error, format!("texture load failed: {error:?}"));
} else {
    let data = tex.data_ref();
}

if let ResourceState::LoadError { path, error } = &*resource.state() {
    log_error(format!("load failed: {path:?}: {error:?}"));
}

fn load_failed<T>(r: &Resource<T>) -> bool {
    matches!(&*r.state(), ResourceState::LoadError { .. })
}

When it happens

Trigger: Dereferencing a handle returned by request::<T>() for a file that does not exist, failed to parse (bad/corrupt format), or whose loader errored (e.g. unsupported image format, malformed scene).

Common situations: Typos in asset paths; assets missing from the build/deployment; files saved in an unsupported version/format; permission or encoding errors when loading.

Understand the failure class

Background: "failed to read file", EACCES, ENOENT and "could not read <path>" errors: when a program can't read a file from disk — this error's family across 49 libraries.

Related errors

• Attempt to get reference to resource data which failed to…
• Animation pool must be empty on load!
• Cast to failed!
• An object at index must be returned to a pool it was taken…
• Attempt to spawn an object at pool record with payload!…

AI-assisted analysis of FyroxEngine/Fyrox@76c91aad8e (2026-09-10). Data as JSON: /api/errors/66b56c18074452d2. Report an issue: GitHub.

Appendix: source

Thrown at fyrox-resource/src/lib.rs:619

                    std::any::type_name::<T>()
                )
            }
            ResourceState::Pending { .. } => {
                panic!(
                    "Attempt to get reference to resource data while it is loading! Type {}",
                    std::any::type_name::<T>()
                )
            }
            ResourceState::LoadError {
                ref path,
                ref error,
            } => {
                let path = if path.as_os_str().is_empty() {
                    "Unknown".to_string()
                } else {
                    format!("{path:?}")
                };
                panic!("Attempt to get reference to resource data which failed to load! Type {}. Path: {path}. Error: {error:?}", std::any::type_name::<T>())
            }
            ResourceState::Ok { ref data } => (data.inner_ref() as &dyn Any)
                .downcast_ref()
                .expect("Type mismatch!"),
        }
    }
}

impl<T> DerefMut for ResourceDataRef<'_, T>
where
    T: TypedResourceData,
{
    fn deref_mut(&mut self) -> &mut Self::Target {
        let header = &mut *self.guard;
        match header.state {
            ResourceState::Unloaded => {
                panic!("Attempt to get reference to resource data while it is unloaded!")
            }

View on GitHub (pinned to 76c91aad8e)