const fs = require('fs'); let web3 = new Web3(new Web3.providers.HttpProvider('http:127.0.0.1')) const abi = fs.readFileSync('erc20_abi.json', 'utf-8') const contractAddress = '0xB4...' const privateKey = '...' let contract = new web3.eth.Contract(JSON.parse(abi), contractAddress); let transfer = contract.methods.transfer("0xd...", 10); let encodedABI = transfer.encodeABI(); var tx = { from: "0xF...", to: contractAddress, gas: 2000000, data: encodedABI }; web3.eth.accounts.signTransaction(tx, privateKey).then(signed => { var tran = web3.eth.sendSignedTransaction(signed.rawTransaction); tran.on('confirmation', (confirmationNumber, receipt) => { console.log('confirmation: ' + confirmationNumber); }); tran.on('transactionHash', hash => { console.log('hash'); console.log(hash); }); tran.on('receipt', receipt => { console.log('reciept'); console.log(receipt); }); tran.on('error', console.error); });

Estoy usando el código anterior para enviar tokens ERC20 de una cuenta a otra cuenta, arroja este error

UnhandledPromiseRejectionWarning: Error: Error devuelto: debe autenticarse