influxdata/influxdb · error · PluginError

invalid cron syntax

Error message

invalid cron syntax: {0}

What it means

PluginError::InvalidCronSyntax, wrapping cron::error::Error when a trigger's cron schedule string cannot be parsed by the cron crate; raised when creating or updating a scheduled trigger with a malformed cron expression.

Solutions

1. Fix the cron expression before passing it to trigger creation
2. Test the expression with the cron crate's parser or an equivalent validator
3. Use a supported 5/6/7-field cron format accepted by the `cron` crate

When it happens

Trigger: Thrown at influxdb3_processing_engine/src/plugins.rs:56 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of influxdata/influxdb@06200ef96b (2026-09-19). Data as JSON: /api/errors/f2aeaf48e8ef0ffe. Report an issue: GitHub.

Appendix: source

Thrown at influxdb3_processing_engine/src/plugins.rs:56

    #[error("couldn't find db")]
    MissingDb,

    #[error(transparent)]
    PyError(#[from] pyo3::PyErr),

    #[error(transparent)]
    WriteBufferError(#[from] write_buffer::Error),

    #[error(transparent)]
    AnyhowError(#[from] anyhow::Error),

    #[error("reading plugin file: {0}")]
    ReadPluginError(#[from] std::io::Error),

    #[error("error executing plugin: {0}")]
    PluginExecutionError(#[from] influxdb3_py_api::error::ExecutePluginError),

    #[error("invalid cron syntax: {0}")]
    InvalidCronSyntax(#[from] cron::error::Error),

    #[error("cron schedule never triggers: {0}")]
    CronScheduleNeverTriggers(String),

    #[error("non-schedule plugin with schedule trigger: {0}")]
    NonSchedulePluginWithScheduleTrigger(String),

    #[error("error fetching plugin from repository: {0} {1}")]
    FetchingFromRepository(reqwest::StatusCode, String),

    #[error(
        "plugin installation is disabled; plugins must already exist in the configured plugin directory"
    )]
    PluginInstallationDisabled,

    #[error("Join error, please report: {0}")]
    JoinError(#[from] tokio::task::JoinError),

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