3|index    | info: approve event = undefined
3|index    | Transaction error:  Error: replacement transaction underpriced
3|index    |     at Object.InvalidResponse (/var/www/smart-account/node_modules/web3/lib/web3/errors.js:38:16)
3|index    |     at /var/www/smart-account/node_modules/web3/lib/web3/requestmanager.js:86:36
3|index    |     at XMLHttpRequest.request.onreadystatechange (/var/www/smart-account/node_modules/web3/lib/web3/httpprovider.js:118:13)
3|index    |     at XMLHttpRequestEventTarget.dispatchEvent (/var/www/smart-account/node_modules/xhr2/lib/xhr2.js:64:18)
3|index    |     at XMLHttpRequest._setReadyState (/var/www/smart-account/node_modules/xhr2/lib/xhr2.js:354:12)
3|index    |     at XMLHttpRequest._onHttpResponseEnd (/var/www/smart-account/node_modules/xhr2/lib/xhr2.js:509:12)
3|index    |     at IncomingMessage.<anonymous> (/var/www/smart-account/node_modules/xhr2/lib/xhr2.js:469:24)
3|index    |     at emitNone (events.js:111:20)
3|index    |     at IncomingMessage.emit (events.js:208:7)
3|index    |     at endReadableNT (_stream_readable.js:1056:12)
3|index    |     at _combinedTickCallback (internal/process/next_tick.js:138:11)
3|index    |     at process._tickDomainCallback (internal/process/next_tick.js:218:9)