Lesson 7: TypeError: customChains is not iterable

[jbadillo99]

Hi,
I have been stuck on this issue for a while I have I keep getting the error below when I deploy on rinkeby, kovan, or goerli and it runs fine whenever it is on the hardhat network. I am not sure if there is an issue with the way that I am writing my verify function.
Thanks in advance for any help

Compiled 8 Solidity files successfully
Deploying FundMe, Waiting for confirmations...
deploying "FundMe" (tx: 0xcb83a48356d0beeaf37d15ab2bc43e89247f45985c91194334da21d5896a0c0d)...: deployed at 0x634915cDE3C7EF9613fa36236F4C67F62FBc69eb with 712591 gas
FundMe deployed at 0x634915cDE3C7EF9613fa36236F4C67F62FBc69eb
Verifying contract...
TypeError: customChains is not iterable
    at getEtherscanEndpoints (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/node_modules/@nomiclabs/hardhat-etherscan/src/network/prober.ts:33:37)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at Environment._runTaskDefinition (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:308:14)
    at Environment.run (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:156:14)
    at SimpleTaskDefinition.verifySubtask [as action] (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/node_modules/@nomiclabs/hardhat-etherscan/src/index.ts:209:30)
    at Environment._runTaskDefinition (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:308:14)
    at Environment.run (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:156:14)
    at verify (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/utils/verify.js:6:9)
    at Object.module.exports [as func] (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/deploy/01-deploy-fund-me.js:36:38)
    at DeploymentsManager.executeDeployScripts (/Users/chitobadillo/Desktop/javascript/hardhat-fund-me/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1220:22)
Verification: undefined
0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e

01-deploy-fund-me.js:

---

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

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

    let ethUsdPriceFeedAddress
    if (developmentChains.includes(network.name)) {
        const ethUsdAggregator = await deployments.get("MockV3Aggregator")
        ethUsdPriceFeedAddress = ethUsdAggregator.address
    } else {
        ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"]
    }
    log("Deploying FundMe, Waiting for confirmations...")

    const fundMe = await deploy("FundMe", {
        from: deployer,
        args: [ethUsdPriceFeedAddress],
        log: true,
        // we need to wait if on a live network so we can verify properly
        waitConfirmations: network.config.blockConfirmations || 1,
    })
    log('FundMe deployed at ${fundMe.address}')

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

        log(`Verification: ${verificationResponse}`)
        log(`${ethUsdPriceFeedAddress}`)
    }
}

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

hardhat.config.js:

---

require("@nomicfoundation/hardhat-toolbox")
require("hardhat-deploy")
require("dotenv").config()

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

const GOERLI_RPC_URL = process.env.GOERLI_RPC_URL
const RINKEBY_RPC_URL = process.env.RINKEBY_RPC_URL
const KOVAN_RPC_URL = process.env.KOVAN_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,
        },
        kovan: {
            url: KOVAN_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 42,
            blockConfirmations: 6,
        },
        goerli: {
            url: GOERLI_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 5,
            blockConfirmations: 5,
        },
        rinkeby: {
            url: RINKEBY_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 4,
            blockConfirmations: 6,
        },
        localhost: {
            url: "http://127.0.0.1:8545/",
            chainId: 31337,
        },
    },
    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
    },
    etherscan: {
        apiKey: ETHERSCAN_API_KEY,
    },
    gasReporter: {
        enabled: true,
        outputFile: "gas-report.txt",
        noColors: true,
        currency: "USD",
        coinmarketcap: COINMARKET_API_KEY,
        token: "MATIC",
    },
    namedAccounts: {
        deployer: {
            default: 0,
            4: 0,
        },
        users: {
            default: 1,
        },
    },
}

verify.js

---

const { run } = require("hardhat")

async function verify(contractAddress, args) {
    console.log("Verifying contract...")
    try {
        await run("verify:verify", {
            address: contractAddress,
            constructorArguments: args,
        })
    } catch (error) {
        if (error.message.toLowerCase().includes("already verified")) {
            console.log("Already verified!")
        } else {
            console.log(error)
        }
    }
}

module.exports = { verify }

[alymurtazamemon]

@jbadillo99 This could be the etherscan API Key issues, most people have faced, you can try later hopefully it will work.

[jackie-cn]

Hi, i have the same issue, i tried many times in a month ,but still couldn't verify. Is there any new solution？

[alymurtazamemon]

@jackie-cn First you should recreate another API key and try that. If you still face issues, then create another discussion, post your issue there and leave the repo link there as well.