Blueshift not connecting alpaca as broker

I followed the instruction of alpaca site video about blueshift. But it stuck as followed.
From blueshift page,
go live ->accept and execute -> continue -> select broker-> add broker -> I selected alpaca paper trading… and I got HTTP ERROR 431

HTTP 431 indicates your browser has too much cookies, and you can try clear the browser cache. We are still investigating how it happens but seems like the recent change to the dashboard made it occur frequently.