Error sending transaction: Returned error: replacement transaction underpriced

[joticajulian]

I'm using the default endpoint

[C] Seed: cc117c0b9a2e56d84896e51f87dd8435c50df54fa07a1964de27bb58b15ec341
[C] Difficulty Target: 000000120962a044cf463dfeb6145ffd571b73b18666ca72e8e6a815d86808cd
[C] Secured Struct Hash: 845d37c5a9bb7aac1a985c35e01ed77eacd1af1abc0d59f57f14fdf31ce9330c
[C] Starting Nonce: 41c35eb158bb27de64197aa04ff50dc538855ea96eba9d795931581246b65f6d
[JS] Error sending transaction: Returned error: replacement transaction underpriced
[JS](app.js) Warning:  {
  kMessage: 'Returned error: replacement transaction underpriced',
  exception: Error: Returned error: replacement transaction underpriced
      at Object.ErrorResponse (/home/ubuntu/koinos-miner/node_modules/web3-core-helpers/src/errors.js:30:19)
      at onJsonrpcResult (/home/ubuntu/koinos-miner/node_modules/web3-core-requestmanager/src/index.js:172:36)
      at XMLHttpRequest.request.onreadystatechange (/home/ubuntu/koinos-miner/node_modules/web3-providers-http/src/index.js:111:13)
      at XMLHttpRequestEventTarget.dispatchEvent (/home/ubuntu/koinos-miner/node_modules/xhr2-cookies/dist/xml-http-request-event-target.js:34:22)
      at XMLHttpRequest._setReadyState (/home/ubuntu/koinos-miner/node_modules/xhr2-cookies/dist/xml-http-request.js:208:14)
      at XMLHttpRequest._onHttpResponseEnd (/home/ubuntu/koinos-miner/node_modules/xhr2-cookies/dist/xml-http-request.js:318:14)
      at IncomingMessage.<anonymous> (/home/ubuntu/koinos-miner/node_modules/xhr2-cookies/dist/xml-http-request.js:289:61)
      at IncomingMessage.emit (events.js:326:22)
      at endReadableNT (_stream_readable.js:1223:12)
      at processTicksAndRejections (internal/process/task_queues.js:84:21) {
    data: null
  }
}