I'm following the instructions off the book Mastering Ethereum, (https://www.onlineprogrammingbooks.com/mastering-ethereum/) and I've hit a snag. I've set up the MetaMask extension and trying to make the first transaction via the Ropsten network. I'm getting the error:
{"error":"[ethjs-query] while formatting outputs from RPC '{\"value\":{\"code\":-32000,\"message\":\"replacement transaction underpriced\"}}'"}
MetaMask is set up on Brave. I've tried with and without VPN.