Cannot read properties of undefined (reading 'length') when deploying Mock Aggregator

[hariprasad9899]

I am trying to deploy Mock Aggregator following the tutorial at 10:49:34, but getting the error as

TypeError: Cannot read properties of undefined (reading 'length')

This error is from the internal module called hardhat deploy

at getFrom (C:\Users\91882\Desktop\Blockchain\Blockchain\03-Fundme\node_modules*hardhat-deploy\src\helpers.ts*:1727:14)

Can someone please help?

My Mock Deply Script

const { network } = require("hardhat");
const { developmentChains, INITIAL_ANSWER, DECIMALS } = require("../helper-hardhat-config");

module.exports = async ({ getNamedAccounts, deployments }) => {
    const { deploy, log } = deployments;
    const { deployer } = await getNamedAccounts();
    const chainId = network.config.chainId;

    if (developmentChains.includes(network.name)) {
        log(`Local Network detected! Deploying mocks..`);
        await deploy("MockV3Aggregator", {
            // contract: "MockV3Aggregator",        
            from: deployer,
            log: true,
            args: [DECIMALS, INITIAL_ANSWER],
        });
        log("Mocks Deployed!! ");
        log("_____________________________________");
    }
};

module.exports.tags = ["all", "mocks"];

Helper Hardhat Config

const networkConfig = {
    5: {
        name: "goerli",
        ethUsdPriceFeed: "0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e",
    },
};

const developmentChains = ["local", "hardhat"];
const DECIMALS = 8;
const INITIAL_ANSWER = 200000000;

module.exports = {
    networkConfig,
    developmentChains,
    DECIMALS,
    INITIAL_ANSWER,
};

Hardhat Config:

const { version } = require("chai");

require("@nomicfoundation/hardhat-toolbox");
require("@nomiclabs/hardhat-solhint");
require("hardhat-deploy");
// require("dotenv").config();
// require("@nomicfoundation/hardhat-toolbox");
require("@nomiclabs/hardhat-etherscan");
require("hardhat-gas-reporter");
require("solidity-coverage");
require("dotenv").config();

/** @type import('hardhat/config').HardhatUserConfig */

const TEST_RPC_URL = process.env.TEST_RPC_URL;
const TEST_PRIVATE_KEY = process.env.TEST_PRIVATE_KEY;
const ETHERSCAN_API = process.env.ETHERSCAN_API;
const COINMARKET_API = process.env.COINMARKET_API;

module.exports = {
    solidity: "0.8.8",
    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
    },
    defaultNetwork: "hardhat",
    networks: {
        goerli: {
            url: TEST_RPC_URL,
            accounts: [TEST_PRIVATE_KEY],
            chainId: 5,
        },
        localhost: {
            url: "http://127.0.0.1:8545/",
            chainId: 31337,
        },
    },
    etherscan: {
        apiKey: ETHERSCAN_API,
    },
    gasReporter: {
        enabled: true,
        noColors: true,
        outputFile: "gasReport.txt",
        currency: "INR",
        coinmarketcap: COINMARKET_API,
    },
};

[alymurtazamemon]

@hariprasad9899 Add this in your hardhat.config.js file;

namedAccounts: {
    deployer: {
        default: 0,
    },
},

[hariprasad9899]

Thanks, @alymurtazamemon. That worked and compiled correctly

[prakhar9015]

thanks you @alymurtazamemon for answering this. It got me unstuck. 🍻

[sonhd91]

I wish I went this discussion earlier, thanks @alymurtazamemon

[Neddie28]

thanks @alymurtazamemon this was really helpful

[SamsShow]

I'm also facing the same error even after updating my hardhat config file I'm unable to get it solved please help me to figure it out

My Mock Deploy Script

const DECIMALS = "8"
const INITIAL_PRICE = "200000000000" // 2000
module.exports = async ({ getNamedAccounts, deployments }) => {
    const { deploy, log } = deployments
    const { deployer } = await getNamedAccounts()
    const chainId = network.config.chainId
    // If we are on a local development network, we need to deploy mocks!


    if (chainId == 31337) {
        log("Local network detected! Deploying mocks...")
        await deploy("MockV3Aggregator", {
            contract: "MockV3Aggregator",
            from: deployer,
            log: true,
            args: [DECIMALS, INITIAL_PRICE],
        })
        log("Mocks Deployed!")
        log("------------------------------------------------")
        log(
            "You are deploying to a local network, you'll need a local network running to interact"
        )
        log(
            "Please run `npx hardhat console` to interact with the deployed smart contracts!"
        )
        log("------------------------------------------------")
    }
}
module.exports.tags = ["all", "mocks"]

My hardhat.config

require("@nomicfoundation/hardhat-toolbox");
require("@nomiclabs/hardhat-solhint");
require('hardhat-deploy');
// require("@nomiclabs/hardhat-waffle")
require("hardhat-gas-reporter")
// require("@nomiclabs/hardhat-etherscan")
require("dotenv").config()
require("solidity-coverage")

// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more
/**
 * @type import('hardhat/config').HardhatUserConfig
 */

const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY || ""
const SEPOLIA_RPC_URL =
    process.env.SEPOLIA_RPC_URL ||
    "https://eth-sepolia.g.alchemy.com/v2/YOUR-API-KEY"
const PRIVATE_KEY =
    process.env.PRIVATE_KEY ||
    "0x11ee3108a03081fe260ecdc106554d09d9d1209bcafd46942b10e02943effc4a"
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY || ""

module.exports = {
    defaultNetwork: "hardhat",
    namedAccounts: {
      deployer: {
          default: 0,
      },
    },
    networks: {
        hardhat: {
            chainId: 31337,
            // gasPrice: 130000000000,
        },
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 11155111,
            blockConfirmations: 6,
        },
    },
    solidity: {
        compilers: [
            {
                version: "^0.8.17",
            },
            {
                version: "^0.8.7",
            },
            {
              version: "^0.6.6",
            },
        ],
    },
    etherscan: {
        apiKey: ETHERSCAN_API_KEY,
        // customChains: [], // uncomment this line if you are getting a TypeError: customChains is not iterable
    },
    gasReporter: {
        enabled: true,
        currency: "USD",
        outputFile: "gas-report.txt",
        noColors: true,
        // coinmarketcap: COINMARKETCAP_API_KEY,
    },
    mocha: {
        timeout: 500000,
    },
}

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  solidity: "0.8.17",
};

Error:

Local network detected! Deploying mocks...
An unexpected error occurred:

Error: 
ERROR processing .....Hardhat_Fundme\deploy\00-deploy-mocks.js:
TypeError: Cannot read properties of undefined (reading 'length')```

[mohakchakraborty2004]

were you able to solve this ?