zeroclaw-labs/zeroclaw · error · anyhow::Error

Invalid cron expression: {expression} (expected 5, 6, or 7 f

Error message

Invalid cron expression: {expression} (expected 5, 6, or 7 fields, got {field_count})

What it means

Error "Invalid cron expression: {expression} (expected 5, 6, or 7 fields, got {field_count})" thrown in zeroclaw-labs/zeroclaw.

Source

Thrown at crates/zeroclaw-runtime/src/cron/schedule.rs:124

    let field_count = expression.split_whitespace().count();

    match field_count {
        // standard crontab syntax: minute hour day month weekday
        // Normalize weekday field from standard crontab semantics (0/7=Sun, 1=Mon, …, 6=Sat)
        // to cron-crate semantics (1=Sun, 2=Mon, …, 7=Sat).
        5 => {
            let mut fields: Vec<&str> = expression.split_whitespace().collect();
            let weekday = fields[4];
            let normalized_weekday = normalize_weekday_field(weekday)?;
            fields[4] = &normalized_weekday;
            Ok(format!(
                "0 {} {} {} {} {}",
                fields[0], fields[1], fields[2], fields[3], fields[4]
            ))
        }
        // crate-native syntax includes seconds (+ optional year)
        6 | 7 => Ok(expression.to_string()),
        _ => anyhow::bail!(
            "Invalid cron expression: {expression} (expected 5, 6, or 7 fields, got {field_count})"
        ),
    }
}

/// Translate a single numeric weekday value from standard crontab semantics
/// (0 or 7 = Sunday, 1 = Monday, …, 6 = Saturday) to cron-crate semantics
/// (1 = Sunday, 2 = Monday, …, 7 = Saturday).
fn translate_weekday_value(val: u8) -> Result<u8> {
    match val {
        0 | 7 => Ok(1), // Sunday
        1..=6 => Ok(val + 1),
        _ => anyhow::bail!("Invalid weekday value: {val} (expected 0-7)"),
    }
}

/// Enumerate the standard-crontab weekday values covered by `start-end`.
fn standard_weekday_range_values(start: u8, end: u8) -> Vec<u8> {

View on GitHub (pinned to 88bb9c8533)

Solutions

1. Use a cron expression with 5, 6, or 7 fields (min hour day month weekday [year]).

When it happens

Trigger: Thrown at crates/zeroclaw-runtime/src/cron/schedule.rs:124 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zeroclaw-labs/zeroclaw@88bb9c8533 (2026-08-23). Data as JSON: /api/errors/152e6fa18fdc75a2. Report an issue: GitHub.