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.

I got this error as well:
{"error":"[ethjs-query] while formatting outputs from RPC '{\"value\":{\"code\":-32000,\"message\":\"replacement transaction underpriced\"}}'"}
For me, I turned off my adblocker and it worked.
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