Lesson 9 : TypeError: Cannot read properties of undefined (reading 'length')

[Alanle1011]

this is the error when I try to run on 15:19;55, it show error "TypeError: Cannot read properties of undefined (reading 'length')"

this is my code for 01-deploy-raffle.js

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

const VRF_SUB_FUND_AMOUNT = ethers.utils.parseEther("30");

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

  if (developmentChains.includes(network.name)) {
    const VRFCoordinatorV2Mock = await ethers.getContract(
      "VRFCoordinatorV2Mock"
    );
    vrfCoordinatorV2Address = VRFCoordinatorV2Mock.address;
    const transactionResponse = await VRFCoordinatorV2Mock.createSubscription();
    const transactionReceipt = await transactionResponse.wait(1);
    subscriptionId = transactionReceipt.events[0].args.subId;
    await VRFCoordinatorV2Mock.fundSubscription(
      subscriptionId,
      VRF_SUB_FUND_AMOUNT
    );
  } else {
    vrfCoordinatorV2Address = networkConfig[chainId]["vrfCoordinatorV2"];
    subscriptionId = networkConfig[chainId]["subscriptionId"];
  }

  const entranceFee = networkConfig[chainId]["entranceFee"];
  const gasLane = networkConfig[chainId]["gasLane"];
  const callbackGasLimit = networkConfig[chainId]["callbackGasLimit"];
  const interval = networkConfig[chainId]["interval"];

  const args = [
    vrfCoordinatorV2Address,
    entranceFee,
    gasLane,
    subscriptionId,
    callbackGasLimit,
    interval,
  ];
  const raffle = await deploy("Raffle", {
    form: deployer,
    args: args,
    log: true,
    waitConfirmations: network.config.blockConfirmations || 1,
  });

  if (
    !developmentChains.includes(network.name) &&
    process.env.ETHERSCAN_API_KEY
  ) {
    log("Verifying...");
    await verify(raffle.address, args);
  }
  log("-----------------------------");
};

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

My hardhat.config.js

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

const GOERLI_RPC_URL = process.env.GOERLI_RPC_URL;
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 || "key";
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY || "key";

module.exports = {
  solidity: "0.8.8",
  defaultNetwork: "hardhat",
  network: {
    hardhat: {
      chainId: 31337,
      blockConfirmations: 1,
    },
    sepolia: {
      chainId: 11155111,
      blockConfirmations: 6,
      url: SEPOLIA_RPC_URL,
      accounts: PRIVATE_KEY,
    },
  },
  namedAccounts: {
    deployer: {
      default: 0, // here this will by default take the first account as deployer
    },
  },
};

[aaankeet]

@Alanle1011
typo in your deploy.raffle.js

const raffle = await deploy("Raffle", {
    form: deployer,   <---- it should be from
    args: args,
    log: true,
    waitConfirmations: network.config.blockConfirmations || 1,
  });

[Alanle1011]

@aaankeet Thank you so much, i went throught the code multiple time but did not see it