Lesson 9, Deploying to Rinkeby: TypeError: Cannot read properties of undefined (reading 'undefined')

[MichaelGKing]

Hello,

I am receiving the following error when I attempt to deploy to the Rinkeby test network:

TypeError: Cannot read properties of undefined (reading 'undefined')

I am unsure what to look for with reading being 'undefined'. Any ideas?

It is saying it is getting this error when processing my 01-deploy-raffle.js. Here is the code for that file:

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

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, 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
    // Need to fund subscription.

    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", {
    from: 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"]

Any help would be much appreciated, thanks.

[MichaelGKing]

Issue turned out to be incorrect syntax:

subscriptionId = networkConfig["chainId"][subscriptionId]

Should be:

subscriptionId = networkConfig[chainId]["subscriptionId"]