bevyengine/bevy · error · TryFromFilteredError

Conversion failed, filtered entity ref does not have write a

Error message

Conversion failed, filtered entity ref does not have write access to all components

What it means

TryFromFilteredError::MissingWriteAccess: converting a FilteredEntityMut into an EntityMut failed because the filtered access set does not grant write access to all of the entity's components — EntityMut requires full write access.

Source

Thrown at crates/bevy_ecs/src/world/entity_access/filtered.rs:811

        self.id()
    }
}

// SAFETY: This type represents one Entity. We implement the comparison traits based on that Entity.
unsafe impl EntityEquivalent for FilteredEntityMut<'_, '_> {}

/// Error type returned by [`TryFrom`] conversions from filtered entity types
/// ([`FilteredEntityRef`]/[`FilteredEntityMut`]) to full-access entity types
/// ([`EntityRef`]/[`EntityMut`]).
#[derive(Error, Debug)]
pub enum TryFromFilteredError {
    /// Error indicating that the filtered entity does not have read access to
    /// all components.
    #[error("Conversion failed, filtered entity ref does not have read access to all components")]
    MissingReadAllAccess,
    /// Error indicating that the filtered entity does not have write access to
    /// all components.
    #[error("Conversion failed, filtered entity ref does not have write access to all components")]
    MissingWriteAllAccess,
}

View on GitHub (pinned to 396ca72708)

Solutions

1. Use try_from / try_into and handle the Err case
2. Get an EntityMut via world.get_entity_mut instead
3. Widen the filtered access so all components are writable

When it happens

Trigger: Thrown at crates/bevy_ecs/src/world/entity_access/filtered.rs:811 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/109d9d196954ceb4. Report an issue: GitHub.