Lesson 7: 10:49:30 => ReferenceError: MockV3Aggregator is not defined.

[Asem-Abdelhady]

I try to deploy the MockV3Aggregator the same as our instructor did and I keep getting MockV3Aggregator is not defined error.

My deployment script

The MockV3Aggregator contract

The helper

[krakxn]

Formatting question properly is key: Instead of screenshots, can you please make a repo and link it here or paste the relevant code here. Thank you

[Asem-Abdelhady]

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

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

    if (developmentChains.includes(network.name)) {
        log("Deploying mocks in a local network !!");
        await deploy("MockV3Aggregator", {
            contract: "MockV3Aggregator",
            from: deployer,
            log: true,
            args: [DECIMALS, INITIAL_ANSWER],
        });

        log("Mocks deployed!");
        log("--------------------------------------------------");
    }
};

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

[Cheng2046]

• In the first screenshot, you didn't wrap MockV3Aggregator with a pair of "". What's the error msg after you fix that? (it will be easier to debug if you provide the hardhat config and helper config too)

[Asem-Abdelhady]

after wrapping:

the new error message:

deployment script:

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

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

    if (developmentChains.includes(network.name)) {
        log("Deploying mocks in a local network !!");
        await deploy("MockV3Aggregator", {
            contract: "MockV3Aggregator",
            from: deployer,
            log: true,
            args: [DECIMALS, INITIAL_ANSWER],
        });

        log("Mocks deployed!");
        log("--------------------------------------------------");
    }
};

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

helper:

const networkConfig = {
    4: {
        name: "rinkeby",
        ethUsdPriceFeed: "0x8A753747A1Fa494EC906cE90E9f37563A8AF630e",
    },
};

const developmentChains = ["hardhat", "localhost"];

const DECIMALS = 8;
const INITIAL_ANSWER = 200000000000;
module.exports = {
    networkConfig,
    developmentChains,
    DECIMALS,
    INITIAL_ANSWER,
};

config:

require("@nomicfoundation/hardhat-toolbox");
require("hardhat-gas-reporter");
require("hardhat-deploy");

/** @type import('hardhat/config').HardhatUserConfig */
const PRIVATE_KEY = process.env.PRIVATE_KEY || "0xkey";
const RINKEBY_URL = process.env.RINKEBY_RPC_URL || "";
const API_KEY = process.env.ETHERSCAN_API_KEY || "key";
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY || "key";
module.exports = {
    // solidity: "0.8.8",
    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
    },
    etherscan: {
        apiKey: API_KEY,
    },

    gasReporter: {
        enabled: true,
        outputFile: "gas-reprot.txt",
        noColors: true,
        currency: "USD",
        coinmarketcap: COINMARKETCAP_API_KEY,
    },
};

[Cheng2046]

cannot read properties of undefined (reading 'length') is coming from the deployer and getNamedAccounts function. you have to add NamedAccount in your config file as below:

require("@nomicfoundation/hardhat-toolbox");
require("hardhat-gas-reporter");
require("hardhat-deploy");

/** @type import('hardhat/config').HardhatUserConfig */
const PRIVATE_KEY = process.env.PRIVATE_KEY || "0xkey";
const RINKEBY_URL = process.env.RINKEBY_RPC_URL || "";
const API_KEY = process.env.ETHERSCAN_API_KEY || "key";
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY || "key";
module.exports = {
    // solidity: "0.8.8",
    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
    },
    etherscan: {
        apiKey: API_KEY,
    },

    gasReporter: {
        enabled: true,
        outputFile: "gas-reprot.txt",
        noColors: true,
        currency: "USD",
        coinmarketcap: COINMARKETCAP_API_KEY,
    },
    namedAccounts: {
        deployer: {
            default: 0,
            1: 0,
        },
    },
};

[Asem-Abdelhady]

Now it works, sorry for the trouble. Thank you for your efforts.

[NagoriMustakim]

which command you have run?
try by running

yarn hardhat deploy --tags mocks

[Asem-Abdelhady]

That is what I did, but still the same error. As you can see the error emerges from line 15 because it actually printed to our console log that is deploying to the local network.

[NagoriMustakim]

In my system, this is perfectly running
try this and let me know

const {
    developmentChains,
    /*DECIMALS,
    INITIAL_ANSWER*/
} = require("../helper-hardhat-config")
const { network } = require("hardhat")
const DECIMALS = "8"
const INITIAL_ANSWER = "200000000000"

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

    if (developmentChains.includes(network.name)) {
        log("Deploying mocks in a local network !!")
        await deploy("MockV3Aggregator", {
            contract: "MockV3Aggregator",
            from: deployer,
            log: true,
            args: [DECIMALS, INITIAL_ANSWER],
        })

        log("Mocks deployed!")
        log("--------------------------------------------------")
    }
}

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

[Asem-Abdelhady]

The code above with the error:

[alymurtazamemon]

@Asem-Abdelhady In the first Image at line 16 update it like this contract: "MockV3Aggregator"

[Asem-Abdelhady]

Tried but nothing happened. I also tried to recompile, check artifacts and contract names and check the config files.

[alymurtazamemon]

@Asem-Abdelhady You did not add this

namedAccounts: {
    deployer: {
      default: 0,
    },
    player: {
      default: 1,
    },
  },

[alymurtazamemon]

@Asem-Abdelhady After setting this if you face other issue then paste the new one below.

[Asem-Abdelhady]

Now it works, thought that the hardhat-deploy environment adds the named accounts by default without the need for me to manually do it. Thank you for your time, efforts and advice. I will try to follow in the future, Truly appreciated it.