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

[Tarunrao0]

while deploying the "01-deploy-fund-me.js" I get the following error:
TypeError: Cannot read properties of undefined (reading 'length')

I've referred the discussions tab and tried to fix what I can, but still am getting this error

Here is my code:

const { network } = require("hardhat")
const { networkConfig, developmentChains } = require("../helper-hardhat-config")
const { verify } = require("../utils/verify")
require("dotenv").config()

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

    let ethUsdPriceFeedAddress
    if (chainId == 31337) {
        const ethUsdAggregator = await deployments.get("MockV3Aggregator")
        ethUsdPriceFeedAddress = ethUsdAggregator.address
    } else {
        ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"]
    }
    log("----------------------------------------------------")
    log("Deploying FundMe and waiting for confirmations...")
    const fundMe = await deploy("FundMe", {
        from: deployer,
        args: [ethUsdPriceFeedAddress],
        log: true,
        waitConfirmations: network.config.blockConfirmations || 1,
    })
    log(`FundMe deployed at ${fundMe.address}`)

    if (
        !developmentChains.includes(network.name) &&
        process.env.ETHERSCAN_API_KEY
    ) {
        await verify(fundMe.address, [ethUsdPriceFeedAddress])
    }
}

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

this is my config:

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

const SEPOLIA_RPC_URL =process.env.SEPOLIA_RPC_URL 
const PRIVATE_KEY =process.env.PRIVATE_KEY 
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY 
const COINMARKET_API_KEY= process.env.COINMARKET_API_KEY

module.exports = {
    defaultNetwork: "hardhat",
    networks: {
        hardhat: {
            chainId: 31337,
            // gasPrice: 130000000000,
        },
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 11155111,
            blockConfirmations: 6,
        },
    },
    solidity: {
        compilers: [
            {
                version: "0.8.8",
            },
            {
                version: "0.6.6",
            },
        ],
    },
    etherscan: {
        apiKey: ETHERSCAN_API_KEY,
        
    },
    gasReporter: {
        enabled: true,
        currency: "USD",
        outputFile: "gas-report.txt",
        noColors: true,
        // coinmarketcap: COINMARKET_API_KEY,
        // token: "MATIC",
       
    },
    namedAccounts: {
        deployer: {
            default: 0,
            11155111: 1, 

        },
    },
    mocha: {
        timeout: 500000,
    },
   
}

this is the link to my repo : https://github.com/Tarunrao0/Hardhat-fund-me

[TheDude-dev]

Hi @Tarunrao0 ! This is usually caused by dependency conflicts. Try to downgrade your dependencies to Patrick's versions. Like your ethers to ethers@^5.5.3, @nomiclabs/hardhat-ethers, hardhat-deploy and so on.

[Tarunrao0]

[TheDude-dev]

That's really strange! As a last resort, try to downgrade your Node.js version to v16. I ran into the same error with lesson 10 and switching to another nodejs version fixed it. Try it if you didn't. Use nvm so you could always switch back to your current version later.

[Tarunrao0]

@Bobodilo I've succesfully cleared all my errors. I redid the project one last time and it ran this time. Thank you so much for helping me out and putting all that effort <3

[Tarunrao0]

the issue was with the dependencies as you pointed out and i had some errors in my smart contract aswell. Sorting it out helped it clear all my errors

[TheDude-dev]

Great! Yeah, you might have some typos in your code but they're easy to fix. The main problems usually come from installing dependencies. It's really frustrating at times. Make sure you mark the discussion as answered so that someone else could use it as a solution next time. Good luck with the next parts of course!

[honxsinatra]

Hello @Tarunrao0 , try to change namedAccounts's format;
instead of ;
namedAccounts: {
deployer: {
default: 0,
11155111: 1,

    },
},

do this;
namedAccounts: {
deployer: {
default: 0,
},
user: {
default: 1,
},
},