nautechsystems/nautilus_trader · error

Failed to start Binance Spot task generation: {e}

Error message

Failed to start Binance Spot task generation: {e}

What it means

Connect-time error in the Binance Spot execution client: spawning the pending-task generator (the async task that submits queued work) failed, so the client cannot complete its connection sequence and the error propagates from connect().

Source

Thrown at crates/adapters/binance/src/spot/execution.rs:863

    fn get_account(&self) -> Option<AccountAny> {
        self.core.cache().account_owned(&self.core.account_id)
    }

    async fn connect(&mut self) -> anyhow::Result<()> {
        if self.core.is_connected() && self.session_tasks.is_open() && self.pending_tasks.is_open()
        {
            return Ok(());
        }

        if !self.pending_tasks.is_open() || !self.session_tasks.is_open() {
            self.teardown_partial_connect().await?;
        }

        if !self.pending_tasks.is_open() {
            self.await_pending_tasks().await?;
            self.pending_tasks.start_generation().map_err(|e| {
                anyhow::anyhow!("Failed to start Binance Spot task generation: {e}")
            })?;
        }

        if !self.session_tasks.is_open() {
            self.await_session_tasks().await?;
            self.session_tasks.start_generation().map_err(|e| {
                anyhow::anyhow!("Failed to start Binance Spot session generation: {e}")
            })?;
        }
        let ws_trading_client = self.ws_trading_client.clone();
        let ws_user_data_client = Arc::clone(&self.ws_user_data_client);
        let setup_guard =
            TaskGroupGuard::new(&[&self.session_tasks, &self.pending_tasks], move || {
                if let Some(client) = ws_trading_client {
                    client.begin_shutdown();
                }

                if let Some(client) = ws_user_data_client.lock().as_ref() {

View on GitHub (pinned to 18893faf8b)

Solutions

1. Reset or recreate the execution client after the failed state
2. Inspect preceding errors that closed the task group before retrying connect

When it happens

Trigger: Thrown at crates/adapters/binance/src/spot/execution.rs:863 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nautechsystems/nautilus_trader@18893faf8b (2026-09-08). Data as JSON: /api/errors/8c1d0cf2c1de3a31. Report an issue: GitHub.