bevyengine/bevy · error · ApplyError

attempted to apply `{from_kind}` to `{to_kind}`

Error message

attempted to apply `{from_kind}` to `{to_kind}`

What it means

ApplyError::MismatchedKinds — PartialReflect::try_apply was asked to apply a value of one ReflectKind (e.g. struct) onto a destination of another kind (e.g. enum), which is impossible. Payloads: from_kind and to_kind ReflectKinds. Apply values of matching kinds.

Source

Thrown at crates/bevy_reflect/src/reflect.rs:23

    ReflectOwned, ReflectRef, TypeInfo, TypePath, Typed,
};
use alloc::borrow::Cow;
use alloc::boxed::Box;
use alloc::string::ToString;
use core::{
    any::{Any, TypeId},
    cmp::Ordering,
    fmt::Debug,
};

use thiserror::Error;

use crate::utility::NonGenericTypeInfoCell;

/// A enumeration of all error outcomes that might happen when running [`try_apply`](PartialReflect::try_apply).
#[derive(Error, Debug)]
pub enum ApplyError {
    #[error("attempted to apply `{from_kind}` to `{to_kind}`")]
    /// Attempted to apply the wrong [kind](ReflectKind) to a type, e.g. a struct to an enum.
    MismatchedKinds {
        /// Kind of the value we attempted to apply.
        from_kind: ReflectKind,
        /// Kind of the type we attempted to apply the value to.
        to_kind: ReflectKind,
    },

    #[error("enum variant `{variant_name}` doesn't have a field named `{field_name}`")]
    /// Enum variant that we tried to apply to was missing a field.
    MissingEnumField {
        /// Name of the enum variant.
        variant_name: Box<str>,
        /// Name of the missing field.
        field_name: Box<str>,
    },

    #[error("`{from_type}` is not `{to_type}`")]

View on GitHub (pinned to 396ca72708)

Solutions

1. Apply a value of the same reflected kind as the target
2. Convert the source to the target's kind before applying

When it happens

Trigger: Thrown at crates/bevy_reflect/src/reflect.rs:23 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/5bf2b40dc4845d2b. Report an issue: GitHub.