Invalid Betfair credentials: password or app key provided bu

Error message

Invalid Betfair credentials: password or app key provided but username is missing

What it means

Error "Invalid Betfair credentials: password or app key provided but username is missing" thrown in nautechsystems/nautilus_trader.

Source

Thrown at crates/adapters/betfair/src/config.rs:71

            .map_err(|e| anyhow::anyhow!("Invalid {label} '{value}': {e}"))?;
    }

    Ok(())
}

fn resolve_credential(
    username: Option<String>,
    password: Option<String>,
    app_key: Option<String>,
) -> anyhow::Result<BetfairCredential> {
    match BetfairCredential::resolve(username, password, app_key) {
        Ok(Some(credential)) => Ok(credential),
        Ok(None) => anyhow::bail!("Missing Betfair credentials in config and environment"),
        Err(e) => Err(match e {
            CredentialError::MissingPassword => anyhow::anyhow!(
                "Invalid Betfair credentials: username provided but password is missing",
            ),
            CredentialError::MissingUsername => anyhow::anyhow!(
                "Invalid Betfair credentials: password or app key provided but username is missing",
            ),
            CredentialError::MissingAppKey => {
                anyhow::anyhow!("Invalid Betfair credentials: app key is missing")
            }
        }),
    }
}

fn build_stream_config(
    stream_host: &Option<String>,
    stream_port: &Option<u16>,
    stream_heartbeat_ms: u64,
    stream_idle_timeout_ms: u64,
    stream_reconnect_delay_initial_ms: u64,
    stream_reconnect_delay_max_ms: u64,
    stream_use_tls: bool,
) -> BetfairStreamConfig {

View on GitHub (pinned to a4b06ed870)

When it happens

Trigger: Thrown at crates/adapters/betfair/src/config.rs:71 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nautechsystems/nautilus_trader@a4b06ed870 (2026-08-16). Data as JSON: /api/errors/9646c8f65b97534a. Report an issue: GitHub.