nautechsystems/nautilus_trader · error

No session token after login

Error message

No session token after login

What it means

Error "No session token after login" thrown in nautechsystems/nautilus_trader.

Source

Thrown at crates/adapters/betfair/src/data.rs:663

        self.instruments.rcu(|m| {
            for inst in &loaded {
                m.insert(inst.id(), inst.clone());
            }
        });

        for inst in &loaded {
            if let Err(e) = self.data_sender.send(DataEvent::Instrument(inst.clone())) {
                log::warn!("Failed to send instrument: {e}");
            }
        }

        log::debug!("Cached {} instruments for {}", loaded.len(), self.client_id,);

        let session_token = self
            .http_client
            .session_token()
            .await
            .ok_or_else(|| anyhow::anyhow!("No session token after login"))?;

        let (reconnect_tx, mut reconnect_rx) = tokio::sync::mpsc::unbounded_channel();

        let handler = Self::create_stream_handler(
            self.data_sender.clone(),
            Arc::clone(&self.instruments),
            self.currency,
            self.provider.min_notional(),
            reconnect_tx.clone(),
            self.clock,
        );

        let stream_client = BetfairStreamClient::connect(
            &self.credential,
            session_token,
            handler,
            self.stream_config.clone(),
        )

View on GitHub (pinned to a4b06ed870)

When it happens

Trigger: Thrown at crates/adapters/betfair/src/data.rs:663 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/56ac2fba9e05118d. Report an issue: GitHub.