Run demo code and get code 429

[llwinner]

I tried to run demo code in readme, and add
const result = await contract.send(transfer)
in the end of the code, I want to send ton to my wallet.
But I got an error: AxiosError: Request failed with status code 429. I do nothing but send transfer, is that a bug? Or I write the wrong code? Please help me, thanks.