bevyengine/bevy · error · ProcessError

The wrong meta type was passed into a processor. This is pro

Error message

The wrong meta type was passed into a processor. This is probably an internal implementation error.

What it means

ProcessError::WrongMetaType: the metadata object passed into the processor is not the concrete meta type the processor expects (e.g. a plain AssetMeta where processor-specific meta is required). This indicates a bug in Bevy's internals or a processor implementation mismatch, not user configuration.

Source

Thrown at crates/bevy_asset/src/processor/process.rs:169

    MissingAssetWriterError(#[from] MissingAssetWriterError),
    #[error(transparent)]
    MissingProcessedAssetReaderError(#[from] MissingProcessedAssetReaderError),
    #[error(transparent)]
    MissingProcessedAssetWriterError(#[from] MissingProcessedAssetWriterError),
    /// Encountered an [`AssetReaderError`] when reading the asset metadata for this path.
    #[error("Failed to read asset metadata for {path}: {err}")]
    #[from(ignore)]
    ReadAssetMetaError {
        path: AssetPath<'static>,
        err: AssetReaderError,
    },
    #[error(transparent)]
    DeserializeMetaError(#[from] DeserializeMetaError),
    #[error(transparent)]
    AssetLoadError(#[from] AssetLoadError),
    /// The wrong meta type was passed into a processor.
    /// This is probably an internal implementation error.
    #[error("The wrong meta type was passed into a processor. This is probably an internal implementation error.")]
    WrongMetaType,
    /// Encountered an error while saving the asset.
    #[error("Encountered an error while saving the asset: {0}")]
    #[from(ignore)]
    AssetSaveError(BevyError),
    /// Encountered an error while transforming the asset.
    #[error("Encountered an error while transforming the asset: {0}")]
    #[from(ignore)]
    AssetTransformError(Box<dyn core::error::Error + Send + Sync + 'static>),
    /// Assets without extensions are not supported.
    #[error("Assets without extensions are not supported.")]
    ExtensionRequired,
}

impl<Loader, Transformer, Saver> Process for LoadTransformAndSave<Loader, Transformer, Saver>
where
    Loader: AssetLoader,
    Transformer: AssetTransformer<AssetInput = Loader::Asset>,

View on GitHub (pinned to 396ca72708)

Solutions

  1. Report the issue to the Bevy repository with a reproduction
  2. Verify a custom processor's get_meta_type implementation matches the meta it downcasts to
Defensive patterns

Strategy: type-guard

When it happens

Trigger: Thrown at crates/bevy_asset/src/processor/process.rs:169 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bevyengine/bevy@396ca72708 (2026-08-20). Data as JSON: /api/errors/7764a6194089f43d. Report an issue: GitHub.