Lesson 7, FundMe, ReferenceError: TypeError: Cannot read properties of undefined (reading 'length')

[cah311]

I am trying to run the command yarn hardhat deploy --tags mocks to test a mock for the local host. This is at about 10:49:26.

I keep on getting getting this error after it detects the local network

Error: ERROR processing /Users/repos/freeCodeCamp_lessons/full-blockchain-solidity-course-js/hardhat-fund-me-fcc/deploy/00-deploy-mocks.js:
TypeError: Cannot read properties of undefined (reading 'length')

along with a large list of files in node_modules.

At this point in the video, under the file 00-deploy-mocks-js, Patrick puts;

module.exports = async ({ getNamedAccounts, deployments }) => {
    const { deploy, log } = deployments
    const { deployer } = await getNamedAccounts()
    
    if (developmentChains.includes(network.name)) {
        log("Local network detected! Deploying mocks...")
        await deploy("MockV3Aggregator", {
            contract: "MockV3Aggregator",
            from: deployer,
            log: true,
            args: [DECIMALS, INITIAL_ANSWER],
        })

but then in a subtitle it says to change the if statement to:

if (chainId == 31337)

I have tried both methods and even copied the files from the repo and I am still getting the same error.

[technophile-04]

Hey could you please share your 00-deploy-mocks.js full code

[cah311]

Thanks for your help but unfortunatly this didnt change anything. I esentially already had that code in my hardhat.config.js, I was just missing:

1:0, 

[cah311]

it looks like the problem is stemming from the helpers.ts file in node modules. The 'from' variable is undefined. I am not sure why since there have been no changes made to this file. I even copied the code straight from the repo and I keep getting the same error

[Maakai123]

can you copy and past your Hardhat.config?

[cah311]

require("dotenv").config()

require("@nomiclabs/hardhat-etherscan")
require("@nomiclabs/hardhat-waffle")
require("hardhat-gas-reporter")
require("solidity-coverage")
require("hardhat-deploy")

// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
    const accounts = await hre.ethers.getSigners()

    for (const account of accounts) {
        console.log(account.address)
    }
})

// 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
 */
module.exports = {
    // solidity: "0.8.8",
    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
    },
    defaultNetwork: "hardhat",
    networks: {
        ropsten: {
            url: process.env.ROPSTEN_URL || "",
            accounts:
                process.env.PRIVATE_KEY !== undefined
                    ? [process.env.PRIVATE_KEY]
                    : [],
        },
    },
    gasReporter: {
        enabled: process.env.REPORT_GAS !== undefined,
        currency: "USD",
    },
    etherscan: {
        apiKey: process.env.ETHERSCAN_API_KEY,
    },
    namedAccounts: {
        deployer: {
            defualt: 0,
            1: 0,
        },
        user: {
            default: 1,
        },
    },
}

[cah311]

The answer below worked but thank you for all your help!

[krakxn]

Try this:

Is the name for contract MockV3Aggregator correct? Just in case there is a typo - also check if the import inside it is correct.

And in hardhat config, replace it with this:

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

If nothing works - try cloning the repo. Cheers.

[Sugunaramkumar]

Try this:

Is the name for contract MockV3Aggregator correct? Just in case there is a typo - also check if the import inside it is correct.

And in hardhat config, replace it with this:

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

If nothing works - try cloning the repo. Cheers.

[Ritik-Agarwal50]

after doing this I got the error of can not find artifacts

[krakxn]

@Ritik-Agarwal50 Make a separate discussion, to keep this organized -- I will look into it!

[DEFIdaniel1]

Thank you. Worked for me!

[krakxn]

@DEFIdaniel1 Awesome, all the best!