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

[bbl4de]

Hi, I'm having issues with deploying my script to sepolia testnet. I read every discussion about this error and didn't find a solution.
Below, I added every file i think might be necessary to solve the issue, if not, here is my repo:
https://github.com/Bartekl-13/raffle_fcc
That's my error message:

 hh deploy --network sepolia
Nothing to compile
1
2
3
An unexpected error occurred:

Error: ERROR processing /root/raffle/deploy/01-deployer-raffle.js:
TypeError: Cannot read properties of undefined (reading 'length')
    at getFrom (/root/raffle/node_modules/hardhat-deploy/src/helpers.ts:1738:14)
    at _deploy (/root/raffle/node_modules/hardhat-deploy/src/helpers.ts:537:15)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at _deployOne (/root/raffle/node_modules/hardhat-deploy/src/helpers.ts:1014:16)
    at Object.module.exports [as func] (/root/raffle/deploy/01-deployer-raffle.js:46:20)
    at DeploymentsManager.executeDeployScripts (/root/raffle/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1222:22)
    at DeploymentsManager.runDeploy (/root/raffle/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1055:5)
    at SimpleTaskDefinition.action (/root/raffle/node_modules/hardhat-deploy/src/index.ts:438:5)
    at Environment._runTaskDefinition (/root/raffle/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/root/raffle/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at DeploymentsManager.executeDeployScripts (/root/raffle/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1225:19)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at DeploymentsManager.runDeploy (/root/raffle/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1055:5)
    at SimpleTaskDefinition.action (/root/raffle/node_modules/hardhat-deploy/src/index.ts:438:5)
    at Environment._runTaskDefinition (/root/raffle/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/root/raffle/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at SimpleTaskDefinition.action (/root/raffle/node_modules/hardhat-deploy/src/index.ts:584:32)
    at Environment._runTaskDefinition (/root/raffle/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/root/raffle/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at SimpleTaskDefinition.action (/root/raffle/node_modules/hardhat-deploy/src/index.ts:669:5)

The numbers in this message were added by me while trying to find the location of the issue. That's my 01-deployer-raffle.js:

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

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

module.exports = async ({ 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
        await vrfCoordinatorV2Mock.fundSubscription(subscriptionId, VRF_SUB_FUND_AMOUNT)
    } else {
        vrfCoordinatorV2Address = networkConfig[chainId]["vrfCoordinatorV2"]
        subscriptionId = networkConfig[chainId]["subscriptionId"]
    }
    const waitBlockConfirmations = developmentChains.includes(network.name)
        ? 1
        : VERIFICATION_BLOCK_CONFIRMATIONS
    console.log("1")
    const entranceFee = networkConfig[chainId]["entranceFee"]
    const gasLane = networkConfig[chainId]["gasLane"]
    const callbackGasLimit = networkConfig[chainId]["callbackGasLimit"]
    const interval = networkConfig[chainId]["interval"]
    console.log("2")
    const args = [
        vrfCoordinatorV2Address,
        entranceFee,
        gasLane,
        subscriptionId,
        callbackGasLimit,
        interval,
    ]
    console.log("3")
    const raffle = await deploy("Raffle", {
        from: deployer,
        args: args,
        log: true,
        waitConfirmations: waitBlockConfirmations,
    })
    console.log("4")
    if (!developmentChains.includes(network.name) && process.env.ETHERSCAN_API_KEY) {
        log("Verifying...")
        await verify(raffle.address, args)
    }

    log("--------------------------------------")
}

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

I'm not sure if any other files are necessary for this problem to be solved so i will just in case add my helpers-hardhat-config:

const { ethers, network } = require("hardhat")

const networkConfig = {
    default: {
        name: "hardhat",
        interval: "30",
        subscriptionId: "0",
    },
    31337: {
        name: "localhost",
        subscriptionId: "0",
        gasLane: "0x474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c", // 30 gwei
        interval: "30",
        entranceFee: ethers.utils.parseEther("0.01"), // 0.01 ETH
        callbackGasLimit: "500000", // 500,000 gas
    },
    11155111: {
        name: "sepolia",
        subscriptionId: "2605",
        gasLane: "0x474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c", // 30 gwei
        interval: "30",
        entranceFee: ethers.utils.parseEther("0.01"), // 0.01 ETH
        callbackGasLimit: "500000", // 500,000 gas
        vrfCoordinatorV2: "0x8103B0A8A00be2DDC778e6e7eaa21791Cd364625",
    },
    1: {
        name: "mainnet",
        interval: "30",
    },
}

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

module.exports = {
    networkConfig,
    developmentChains,
}

and my 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()

const SEPOLIA_RPC_URL = "https://eth-sepolia.g.alchemy.com/v2/pw4o0NsAfPP85qILBOy7aY7lz7kUnQvH"
const PRIVATE_KEY = process.env.PRIVATE_KEY
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
    defaultNetwork: "hardhat",
    networks: {
        hardhat: {
            chainId: 31337,
            blockConfirmations: 1,
        },
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
            saveDeployments: true,
            chainId: 11155111,
        },
    },
    gasReporter: {
        enabled: false,
        currency: "USD",
        outputFile: "gas-report.txt",
        noColors: true,
    },
    solidity: "0.8.7",
    namedAccounts: {
        deployer: {
            default: 0,
        },
        player: {
            default: 1,
        },
    },
    mocha: {
        timeout: 300000, // 300 seconds max
    },
    etherscan: {
        apiKey: ETHERSCAN_API_KEY,
    },
}

[alymurtazamemon]

@Bartekl-13 It is throwing an undefined error because the deployer is undefined. Your deploy script is not able to read your env variables because you have added const before them const PRIVATE_KEY ="SECRET" this is not javascript!

update these like this;

- const SEPOLIA_RPC_URL ="https://eth-sepolia.g.alchemy.com/v2/..."
- const PRIVATE_KEY ="SECRET"
- const ETHERSCAN_API_KEY ="..."
+ SEPOLIA_RPC_URL="https://eth-sepolia.g.alchemy.com/v2/..."
+ PRIVATE_KEY="SECRET"
+ ETHERSCAN_API_KEY="..."

And one more thing, your etherscan and alchemy API keys are important too, do not share them as well.

[bbl4de]

Thank you so much for such a quick response! It worked, I didn't have much JavaScript experience before this course so I had no idea it might be the solution. API keys are for "temporary" email accounts on etherscan and alchemy made just for the course, but thank you I forgot to exclude .env from git push.