Lession 7 When deploy 01-deploy-fund-me.js , error:expected 1 constructor arguments, got 0

[Sakana-xc]

Hi guys, I am @10.52, I am trying to run yarn hardhat deply for both 00-mocks.js and 01-deploy-fund-me.js,
mocks work fine but 01-deploy-fund-me.js give me an error:

Error: ERROR processing /Users/cong1/Desktop/1/hardhat-fund-me-fcc/deploy/01-deploy-fund-me.js:
Error: expected 1 constructor arguments, got 0

Here is my 01-deploy-fund-me.js code

/ import
// main function
// calling of main function

//function deployFunc() {
//    console.log("Hi!")
// }

// module.exports.default = deployFunc

const { getNamedAccounts, deployments, network } = require("hardhat")
const { networkConfig, developmentChains } = require("../helper-hardhat-config")

module.exports = async ({ getNamedAccounts, deployments }) => {
    const { deploy, log } = deployments
    const { deployer } = await getNamedAccounts()
    const chainId = network.config.chainId
    //if chainID is X use address Y

    // if the contract doesn't exist, we deploya mininmal version
    // for our local testing
    let ethUsdPriceFeedAddress
    if (developmentChains.includes(network.name)) {
        const ethUsdAggregator = await deployments.get("MockV3Aggregator")
        ethUsdPriceFeedAddress = ethUsdAggregator.address
    } else {
        ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"]
    }

    //whengoing for localhost or hardhat network we want to use a mock
    const fundMe = await deploy("FundMe", {
        from: deployer,
        arg: [ethUsdPriceFeedAddress],
        log: true,
    })
    log("--------------------------------------")
}

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

Here is my helper-hardhat config.js

const networkConfig = {
    4: {
        name: "rinkeby",
        ethUSDpriceFeed: "0x8A753747A1Fa494EC906cE90E9f37563A8AF630e",
    },
    137: {
        name: "polygon",
        ethUSDpriceFeed: " 0xF9680D99D6C9589e2a93a78A04A279e509205945",
    },
}

const developmentChains = ["hardhat", "localhost"]
const DECIMALS = 8
const INITIAL_ANSWER = 200000000000

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

In 01 I tried const { networkConfig, developmentChains } = require("../helper-hardhat-config"), const { developmentChains } = require("../helper-hardhat-config")
It returns Error: expected 1 constructor arguments, got 0, When I try const { networkConfig}=require("../helper-hardhat-config")
It returns error: deploymentchain is not defined.

Would much appreciate for a help.

[krakxn]

The following changes should fix your problem. Cheers

• yarn hardhat deply should be deploy and for deploy-fund-me done by running seperately for local networks and testnets via --network xyz
• / import should be commented out
• Do you have this in hardhat.config? Below:

namedAccounts: {
        deployer: {
            default: 0, // here this will by default take the first account as deployer
            1: 0, // similarly on mainnet it will take the first account as deployer. Note though that depending on how hardhat network are configured, the account 0 on one network can be different than on another
        },

Also, in helper-hardhat-config, you should follow camel case. Problem lies in ethUSDpriceFeed, edit it out to ethUsdPriceFeed as given in your deploy-fund-me.

const networkConfig = {
    4: {
        name: "rinkeby",
        ethUsdPriceFeed: "0x8A753747A1Fa494EC906cE90E9f37563A8AF630e",
    },
    137: {
        name: "polygon",
        ethUsdPriceFeed: " 0xF9680D99D6C9589e2a93a78A04A279e509205945",
    },
}

In deploy-fund-me, edit arg to args

 const fundMe = await deploy("FundMe", {
        from: deployer,
        args: [ethUsdPriceFeedAddress],
        log: true,
    })

[Sakana-xc]

Thanks krakxn, that fixed my probem! I made so many typos there. ethUSDpriceFeed in my helper.js doesn't match the one in deploy.js, thus vscode get confused and say the deploymentchain undefined. Thank you now I now where to check my problems if this happens again.

[krakxn]

You're welcome! It happens, I would recommend following the same style (besides the prevailing camel case convention); All the best with the course!