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

[Alanle1011]

This is my 01-deploy-raffle.js and i run to this problem at 15:19:55 when I try to deploy the contract to hardhat

`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"];
hardhat.config.jsrequire("@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
},
},
};
`

This is the error:

`Debugger attached.
yarn run v1.22.19
warning package.json: No license field
$ /home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/.bin/hardhat deploy
Debugger attached.
Nothing to compile
Local network detected! Deploying mocks ...
deploying "VRFCoordinatorV2Mock" (tx: 0x943bba99f5f8086776d6cdb4802eaa8a7605f1273f6e6ee44f72e50fda0b31b1)...: deployed at 0x5FbDB2315678afecb367f032d93F642f64180aa3 with 2544160 gas
Mocks deployed

An unexpected error occurred:

Error: ERROR processing /home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/deploy/01-deploy-raffle.js:
TypeError: Cannot read properties of undefined (reading 'length')
at getFrom (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/helpers.ts:1642:14)
at _deploy (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/helpers.ts:537:9)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at runNextTicks (node:internal/process/task_queues:65:3)
at listOnTimeout (node:internal/timers:528:9)
at processTimers (node:internal/timers:502:7)
at _deployOne (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/helpers.ts:934:16)
at Object.module.exports [as func] (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/deploy/01-deploy-raffle.js:47:18)
at DeploymentsManager.executeDeployScripts (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1220:22)
at DeploymentsManager.runDeploy (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1053:5)
at DeploymentsManager.executeDeployScripts (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1223:19)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at runNextTicks (node:internal/process/task_queues:65:3)
at listOnTimeout (node:internal/timers:528:9)
at processTimers (node:internal/timers:502:7)
at DeploymentsManager.runDeploy (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1053:5)
at SimpleTaskDefinition.action (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/index.ts:409:5)
at Environment._runTaskDefinition (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
at Environment.run (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
at SimpleTaskDefinition.action (/home/alanle1011/hardhat_course/hardhat-smartcontract-lottery/node_modules/hardhat-deploy/src/index.ts:555:32)
Waiting for the debugger to disconnect...
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Waiting for the debugger to disconnect...`