lesson14: customChains is not iterable

[Bilalbasheer100]

when iam verifying the contract this error pops up....my contract is deployed in sepolia test network but icant verify.
i have already used most of the solutions from the discussions.. but unfortunately none of them actually works

Error
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$ /Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/.bin/hardhat deploy --network sepolia
Nothing to compile
----------------------------------------------------
reusing "NftMarketplace" at 0x154Dd96e55C9a2bc16ac7B7e671A5E3df7622f0f
Verifying...
Verifying contract...
TypeError: customChains is not iterable
    at getEtherscanEndpoints (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/@nomiclabs/hardhat-etherscan/src/network/prober.ts:23:37)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at Environment._runTaskDefinition (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at SimpleTaskDefinition.verifySubtask [as action] (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/@nomiclabs/hardhat-etherscan/src/index.ts:221:30)
    at Environment._runTaskDefinition (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at verify (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/utils/verify.js:6:9)
    at Object.module.exports [as func] (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/deploy/01-deploy-nft-marketplace.js:24:9)
    at DeploymentsManager.executeDeployScripts (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1220:22)
----------------------------------------------------
----------------------------------------------------
reusing "BasicNft" at 0x5Ac9d779398cd8EC5ECd1E3800a53e8940c42b3E
reusing "BasicNftTwo" at 0x8D6291b8c4D82B0Abcd5358c2b36b3DFE1E69F6a
Verifying...
Verifying contract...
TypeError: customChains is not iterable
    at getEtherscanEndpoints (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/@nomiclabs/hardhat-etherscan/src/network/prober.ts:23:37)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at Environment._runTaskDefinition (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at SimpleTaskDefinition.verifySubtask [as action] (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/@nomiclabs/hardhat-etherscan/src/index.ts:221:30)
    at Environment._runTaskDefinition (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at verify (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/utils/verify.js:6:9)
    at Object.module.exports [as func] (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/deploy/02-deploy-basic-nft.js:33:9)
    at DeploymentsManager.executeDeployScripts (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1220:22)
Verifying contract...
TypeError: customChains is not iterable
    at getEtherscanEndpoints (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/@nomiclabs/hardhat-etherscan/src/network/prober.ts:23:37)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at Environment._runTaskDefinition (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at SimpleTaskDefinition.verifySubtask [as action] (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/@nomiclabs/hardhat-etherscan/src/index.ts:221:30)
    at Environment._runTaskDefinition (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at verify (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/utils/verify.js:6:9)
    at Object.module.exports [as func] (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/deploy/02-deploy-basic-nft.js:34:9)
    at DeploymentsManager.executeDeployScripts (/Users/mohammedbilal/Desktop/hh-fcc/hardhat-nft-marketplace/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1220:22)
----------------------------------------------------
Writing to front end...
Front end written!
✨  Done in 7.12s.

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

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

const MAINNET_RPC_URL =
    process.env.MAINNET_RPC_URL ||
    process.env.ALCHEMY_MAINNET_RPC_URL ||
    "https://eth-mainnet.alchemyapi.io/v2/your-api-key"
const SEPOLIA_RPC_URL =
    process.env.SEPOLIA_RPC_URL || "https://eth-sepolia.g.alchemy.com/v2/YOUR-API-KEY"
const POLYGON_MAINNET_RPC_URL =
    process.env.POLYGON_MAINNET_RPC_URL || "https://polygon-mainnet.alchemyapi.io/v2/your-api-key"
const PRIVATE_KEY = process.env.PRIVATE_KEY || "0x"
// optional
const MNEMONIC = process.env.MNEMONIC || "your mnemonic"

// Your API key for Etherscan, obtain one at https://etherscan.io/
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY || "Your etherscan API key"
const POLYGONSCAN_API_KEY = process.env.POLYGONSCAN_API_KEY || "Your polygonscan API key"
const REPORT_GAS = process.env.REPORT_GAS || false

module.exports = {
    defaultNetwork: "hardhat",
    networks: {
        hardhat: {
            // // If you want to do some forking, uncomment this
            // forking: {
            //   url: MAINNET_RPC_URL
            // }
            chainId: 31337,
        },
        localhost: {
            chainId: 31337,
        },
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
            //   accounts: {
            //     mnemonic: MNEMONIC,
            //   },
            saveDeployments: true,
            chainId: 11155111,
        },
        mainnet: {
            url: MAINNET_RPC_URL,
            accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
            //   accounts: {
            //     mnemonic: MNEMONIC,
            //   },
            saveDeployments: true,
            chainId: 1,
        },
        polygon: {
            url: POLYGON_MAINNET_RPC_URL,
            accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
            saveDeployments: true,
            chainId: 137,
        },
    },
    etherscan: {
        // npx hardhat verify --network <NETWORK> <CONTRACT_ADDRESS> <CONSTRUCTOR_PARAMETERS>
        apiKey: {
            sepolia: ETHERSCAN_API_KEY,
            polygon: POLYGONSCAN_API_KEY,
        },
    },
    gasReporter: {
        enabled: REPORT_GAS,
        currency: "USD",
        outputFile: "gas-report.txt",
        noColors: true,
        // coinmarketcap: process.env.COINMARKETCAP_API_KEY,
    },
    contractSizer: {
        runOnCompile: false,
        only: ["NftMarketplace"],
    },
    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
        },
        player: {
            default: 1,
        },
    },
    solidity: {
        compilers: [
            {
                version: "0.8.7",
            },
            {
                version: "0.4.24",
            },
        ],
    },
    mocha: {
        timeout: 200000, // 200 seconds max for running tests
    },
}

[alymurtazamemon]

@Bilalbasheer100 Can you please leave your repo link?

[sodexx7]

the below configs in hardhat.config.js work for me.

  In case the module can't find the rinkeby etherscan automatically
        customChains: [
            {
                network: "rinkeby",
                chainId: 4,
                urls: {
                    apiURL: "https://api-rinkeby.etherscan.io/api",
                    browserURL: "https://rinkeby.etherscan.io",
                },
            },
        ],

You can check out here:
#489