TypeError: Cannot read property 'vrfCoordinatorV2' of undefined

[SamarthBagga]

I am getting this error while tyring to deploy on the sepolia testnet-

Error: ERROR processing /home/samarth/web3/hardhat-smartcontract-lottery/deploy/01-deploy-raffle.js:
TypeError: Cannot read property 'vrfCoordinatorV2' of undefined
    at Object.module.exports [as func] (/home/samarth/web3/hardhat-smartcontract-lottery/deploy/01-deploy-raffle.js:28:57)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at DeploymentsManager.executeDeployScripts (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1226:22)
    at DeploymentsManager.runDeploy (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1059:5)
    at SimpleTaskDefinition.action (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/index.ts:438:5)
    at Environment._runTaskDefinition (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:333:14)
    at Environment.run (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:166:14)
    at SimpleTaskDefinition.action (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/index.ts:584:32)
    at Environment._runTaskDefinition (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:333:14)
    at Environment.run (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:166:14)
    at DeploymentsManager.executeDeployScripts (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1229:19)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at DeploymentsManager.runDeploy (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1059:5)
    at SimpleTaskDefinition.action (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/index.ts:438:5)
    at Environment._runTaskDefinition (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:333:14)
    at Environment.run (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:166:14)
    at SimpleTaskDefinition.action (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/index.ts:584:32)
    at Environment._runTaskDefinition (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:333:14)
    at Environment.run (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:166:14)
    at SimpleTaskDefinition.action (/home/samarth/web3/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/index.ts:669:5)
error Command failed with exit code 1.

deploy raffle file-

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

const FUND_AMOUNT = ethers.parseEther("1") // 1 Ether, or 1e18 (10^18) Wei

module.exports = async ({ getNamedAccounts, deployments }) => {
    const { deploy, log } = deployments
    const { deployer } = await getNamedAccounts()
    const chainId = network.config.chainId
    let vrfCoordinatorV2Address, subscriptionId, vrfCoordinatorV2Mock

    if (chainId == 31337) {
        // create VRFV2 Subscription
        vrfCoordinatorV2Mock = await ethers.getContract("VRFCoordinatorV2Mock")
        vrfCoordinatorV2Address = await vrfCoordinatorV2Mock.getAddress()
        const transactionResponse = await vrfCoordinatorV2Mock.createSubscription()
        const transactionReceipt = await transactionResponse.wait()
        subscriptionId = transactionReceipt.events[0].args.subId
                // Fund the subscription
        // Our mock makes it so we don't actually have to worry about sending fund
        await vrfCoordinatorV2Mock.fundSubscription(subscriptionId, FUND_AMOUNT)
    } else {
        vrfCoordinatorV2Address = networkConfig[chainId]["vrfCoordinatorV2"]
        subscriptionId = networkConfig[chainId]["subscriptionId"]
    }
    const waitBlockConfirmations = developmentChains.includes(network.name)
        ? 1
        : VERIFICATION_BLOCK_CONFIRMATIONS

    log("----------------------------------------------------")
    const arguments = [
        vrfCoordinatorV2Address,
        subscriptionId,
        networkConfig[chainId]["gasLane"],
        networkConfig[chainId]["keepersUpdateInterval"],
        networkConfig[chainId]["raffleEntranceFee"],
        networkConfig[chainId]["callbackGasLimit"],
    ]
    const raffle = await deploy("Raffle", {
        from: deployer,
        args: arguments,
        log: true,
        waitConfirmations: waitBlockConfirmations,
    })

    // Ensure the Raffle contract is a valid consumer of the VRFCoordinatorV2Mock contract.
    if (developmentChains.includes(network.name)) {
        const vrfCoordinatorV2Mock = await ethers.getContract("VRFCoordinatorV2Mock")
        await vrfCoordinatorV2Mock.addConsumer(subscriptionId, raffle.address)
    }

    // Verify the deployment
    if (!developmentChains.includes(network.name) && process.env.ETHERSCAN_API_KEY) {
        log("Verifying...")
        await verify(raffle.address, arguments)
    }

    log("Enter lottery with command:")
    const networkName = network.name == "hardhat" ? "localhost" : network.name
    log(`yarn hardhat run scripts/enterRaffle.js --network ${networkName}`)
    log("----------------------------------------------------")
}

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

helper-hardhat-config.js-

const { ethers } = require("hardhat")

const networkConfig = {
    default: {
        name: "hardhat",
        keepersUpdateInterval: "30",
    },
    111555111: {
        name: "sepolia",
        vrfCoordinatorV2: "0x271682DEB8C4E0901D1a1550aD2e64D568E69909",
        raffleEntranceFee: ethers.parseEther("0.01"),
        gasLane: "0x474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c",
        subscriptionId: "4435",
        callbackGasLimit: "500000",
        keepersUpdateInterval: "30",
    },
    31337: {
        name: "hardhat",
        subscriptionId: "6926",
        raffleEntranceFee: ethers.parseEther("0.01"),
        gasLane: "0x474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c",
        keepersUpdateInterval: "30",
        callbackGasLimit: "500000",
    },
}

const developmentChains = ["hardhat", "localhost"]

module.exports = {
    networkConfig,
    developmentChains,
}

[Amrit-ko]

Hello, you have a wrong chainId of Sepolia network
yours is 111555111
correct is 11155111