bevyengine/bevy · error · ArgCountOutOfBoundsError

argument count out of bounds: {0}

Error message

argument count out of bounds: {0}

What it means

ArgCountError — the number of arguments in an ArgList is outside the valid range (below the expected count or above ArgCount::MAX_COUNT); the offending count is the payload. Supply the exact number of arguments the function signature requires.

Source

Thrown at crates/bevy_reflect/src/func/args/error.rs:41

    #[error("expected {expected} value but received {received} value (@ argument index {index})")]
    InvalidOwnership {
        /// Argument index.
        index: usize,
        /// Expected ownership.
        expected: Ownership,
        /// Received ownership.
        received: Ownership,
    },
    /// Occurs when attempting to access an argument from an empty [`ArgList`].
    ///
    /// [`ArgList`]: crate::func::args::ArgList
    #[error("expected an argument but received none")]
    EmptyArgList,
}

/// The given argument count is out of bounds.
#[derive(Debug, Error, PartialEq)]
#[error("argument count out of bounds: {0}")]
pub struct ArgCountOutOfBoundsError(pub usize);

View on GitHub (pinned to 396ca72708)

Solutions

1. Reduce the number of arguments to within the supported bounds
2. Bundle arguments into a struct type when more are needed

When it happens

Trigger: Thrown at crates/bevy_reflect/src/func/args/error.rs:41 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/7ef552fd16d9867a. Report an issue: GitHub.