How to solve sender doesn t have enough funds to send tx error in Ethereum

Question

I am trying to write an Ethereum contract and I am able to migrate the contract without any problem, but I am facing a problem that I don’t understand. I am not able to buy tokens because gas price is high. I don’t understand what is wrong. Please help.

2_deploy_contracts.js

const TestTokenCrowdsale = artifacts.require('./TestTokenCrowdsale.sol');

var walletAddress =

require('fs').readFileSync('../keystore/address').toString();


const duration = {

    seconds: function(val) { return val},

    minutes: function(val) { return val * this.seconds(60) },

    hours:   function(val) { return val * this.minutes(60) },

    days:    function(val) { return val * this.hours(24) },

    weeks:   function(val) { return val * this.days(7) },

    years:   function(val) { return val * this.days(365)}

};


module.exports = function(deployer) {

  const startTime = 1515896330 + duration.minutes(5);

  const endTime = startTime + duration.minutes(20);

  const rate = new web3.BigNumber(2);

  const cap = new web3.BigNumber(1000000000000000000);

  const tokenAddress = '****';


  deployer.deploy(TestTokenCrowdsale, startTime, endTime, rate, cap, walletAddress, tokenAddress);

}

TestTokenCrowdsale.sol

pragma solidity ^0.4.18;

import 'zeppelin-solidity/contracts/crowdsale/CappedCrowdsale.sol';

import './TestToken.sol';


contract TestTokenCrowdsale is CappedCrowdsale {


  address public tokenAddress;

  FrontierToken public testToken;


  /**

   * @dev Crowdsale initializer.

   * @param _startTime -> Crowdsale start time in UNIX seconds.

   * @param _endTime -> Crowdsale end time in UNIX seconds.

   * @param _rate -> TST/ETH exchange rate.

   * @param _cap -> Fund cap in Wei.

   * @param _wallet -> Wallet to collect Ether.

   * @param _tokenAddress -> Deployed TestToken address.

   */

  function TestTokenCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, uint256 _cap, address _wallet, address _tokenAddress)

    CappedCrowdsale(_cap)

    Crowdsale(_startTime, _endTime, _rate, _wallet) public {


    tokenAddress = _tokenAddress;

    token = createTokenContract();

  }


  function createTokenContract() internal returns (MintableToken) {

    testToken = TestToken(tokenAddress);

    return TestToken(tokenAddress);

  }

}

TestToken.sol

pragma solidity ^0.4.18;


import 'zeppelin-solidity/contracts/token/MintableToken.sol';

import 'zeppelin-solidity/contracts/token/BurnableToken.sol';


contract FrontierToken is MintableToken, BurnableToken {

  string public name = "Test Token";

  string public symbol = "TST";

  uint8 public decimals = 18;

}

The error I am getting is as follows:

truffle(develop)> c.buyTokens("0x627306090abab3a6e1400e9345bc60c78a8bef57", {value: 0.00000000000001})

Error: Error: sender doesn't have enough funds to send tx. The upfront cost is: 1188468318377797839569896498995073345436650825553660099636 and the sender's account only has: 99249141200000000000

at runCall (/usr/local/lib/node_modules/truffle/build/chain.bundled.js:67228:10)

at /usr/local/lib/node_modules/truffle/build/chain.bundled.js:14393:24

at replenish (/usr/local/lib/node_modules/truffle/build/chain.bundled.js:11525:17)

at iterateeCallback (/usr/local/lib/node_modules/truffle/build/chain.bundled.js:11510:17)

at /usr/local/lib/node_modules/truffle/build/chain.bundled.js:11485:16

at /usr/local/lib/node_modules/truffle/build/chain.bundled.js:14398:13

at /usr/local/lib/node_modules/truffle/build/chain.bundled.js:63440:16

at replenish (/usr/local/lib/node_modules/truffle/build/chain.bundled.js:63387:25)

at /usr/local/lib/node_modules/truffle/build/chain.bundled.js:63396:9

at eachLimit (/usr/local/lib/node_modules/truffle/build/chain.bundled.js:63320:36)

at Object.InvalidResponse (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:41484:16)

at /usr/local/lib/node_modules/truffle/build/cli.bundled.js:329530:36

at /usr/local/lib/node_modules/truffle/build/cli.bundled.js:325200:9

at XMLHttpRequest.request.onreadystatechange (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:328229:7)

at XMLHttpRequestEventTarget.dispatchEvent (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:176415:18)

at XMLHttpRequest._setReadyState (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:176705:12)

at XMLHttpRequest._onHttpResponseEnd (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:176860:12)

at IncomingMessage.<anonymous> (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:176820:24)

at emitNone (events.js:110:20)

at IncomingMessage.emit (events.js:207:7)

Answer 1

There’s a mistake in your code. You have to use web3.utils.toWei(0.00000000000001, 'ether') code to send your value properly.

You can use the following code:

pragma solidity ^0.4.18;

contract Test {

  uint256 public balance;


  function somePayable() public payable {

    balance = msg.value;

  }

}

It should solve your error.

Get your Blockchain certification today to learn more about this technology.

Thanks.

Answer 2

I also had the same error. I was able to solve it by changing the mnemonic in my truffle-config.js to match the mnemonic given by Ganache CLI.

Because each time you run Ganache, the mnemonic changes. but you have to remember to change it in your config file to access the funds in the correct account