I'm getting following error message when trying to unlock account on AWS Lambda:

Error: Node error: {"code":-32601,"message":"The method personal_unlockAccount does not exist/is not available"}
    at Function.validate (/var/task/node_modules/web3-providers/dist/web3-providers.cjs.js:111:18)
    at HttpProvider._callee$ (/var/task/node_modules/web3-providers/dist/web3-providers.cjs.js:674:61)
    at tryCatch (/var/task/node_modules/regenerator-runtime/runtime.js:45:40)
    at Generator.invoke [as _invoke] (/var/task/node_modules/regenerator-runtime/runtime.js:271:22)
    at Generator.prototype.(anonymous function) [as next] (/var/task/node_modules/regenerator-runtime/runtime.js:97:21)
    at asyncGeneratorStep (/var/task/node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:24)
    at _next (/var/task/node_modules/@babel/runtime/helpers/asyncToGenerator.js:25:9)
    at <anonymous>
    at process._tickDomainCallback (internal/process/next_tick.js:228:7)
'use strict';

const AWS = require('aws-sdk');
AWS.config.update({region: 'ap-northeast-1'});
const documentClient = new AWS.DynamoDB.DocumentClient();

const Web3 = require('web3');  
const web3 = new Web3(new Web3.providers.HttpProvider(process.env['INFURA_ENDPOINT']));
const abiSource = require('./lib/myToken.json');
const abi = abiSource.abi;
const contractAddress = process.env['CONTRACT_ADDRESS'];
const myToken = web3.eth.Contract(abi, contractAddress);


exports.handler = async (event, context) => {
  event = event.body || event;
  const senderAddress = event.sender_address;
  const privateKey = event.private_key;
    await web3.eth.personal.unlockAccount(senderAddress, privateKey, 600);
    return getResponse(200, 'Internal server error');


My contract is deployed on Ropsten network, Although I have some code for processing transaction in following, which raises same error. Any ideas how to fix that / what the cause of error is?

Node version: 8.0 Web3: 1.0.0-beta50

Thanks in advance!

  • 1
    Node version: 8.0 is a very insufficient piece of information. What type of node is this (e.g., Parity, Geth, etc)? – goodvibration Mar 24 '19 at 9:22
  • In any case, you probably forgot to enable the personal API when you started that node. For example, in Parity, see --jsonrpc-apis or --ws-apis or --ipc-apis (choose the one corresponding to your connection type, most likely the first one I suppose). – goodvibration Mar 24 '19 at 9:25
  • I also recommend that you use web3.js v1.0.0-beta34 (or at most 37). There have been various issues in later versions AFAIK. – goodvibration Mar 24 '19 at 9:27
  • I mean Node.js 8.x as AWS Lambda execution environment, and Infura.io for Ethereum client. For now I've downgraded to v1.0.0-beta34, but the consequence remain same. Let me look it up 2nd comment and figure it out, thanks! – taruya Mar 24 '19 at 13:42

You need to install a web3 layer for your lambda. See https://github.com/scenarex/web3-lambda-layer for how to do so.

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