openai/codex · error · std::io::Error

{field_label} cannot contain duplicates

Error message

{field_label} cannot contain duplicates

What it means

Error "{field_label} cannot contain duplicates" thrown in openai/codex.

Source

Thrown at codex-rs/core/src/config/agent_roles.rs:454

            std::io::ErrorKind::InvalidInput,
            format!("{field_label} must contain at least one name"),
        ));
    }

    let mut normalized_candidates = Vec::with_capacity(nickname_candidates.len());
    let mut seen_candidates = BTreeSet::new();

    for nickname in nickname_candidates {
        let normalized_nickname = nickname.trim();
        if normalized_nickname.is_empty() {
            return Err(std::io::Error::new(
                std::io::ErrorKind::InvalidInput,
                format!("{field_label} cannot contain blank names"),
            ));
        }

        if !seen_candidates.insert(normalized_nickname.to_owned()) {
            return Err(std::io::Error::new(
                std::io::ErrorKind::InvalidInput,
                format!("{field_label} cannot contain duplicates"),
            ));
        }

        if !normalized_nickname
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || matches!(c, ' ' | '-' | '_'))
        {
            return Err(std::io::Error::new(
                std::io::ErrorKind::InvalidInput,
                format!(
                    "{field_label} may only contain ASCII letters, digits, spaces, hyphens, and underscores"
                ),
            ));
        }

        normalized_candidates.push(normalized_nickname.to_owned());

View on GitHub (pinned to 339751715c)

Solutions

1. Remove the duplicate names from {field_label}.

When it happens

Trigger: Thrown at codex-rs/core/src/config/agent_roles.rs:454 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/3fb73949096f26ad. Report an issue: GitHub.