Cannot read properties of undefined (reading 'ethUsdPriceFeed')

[Night-Prime]

Hi, Currently at (10:50:20) of the tutorial and i keep getting this error above following the tutorial, i am unable to fix it.
Here are my code :

1. 01-deploy-fund-me.js

// if we are deploying to a mock ( a kind of an offline testnet)
    let ethUsdPriceFeedAddress
    if (chainId == 31337) {
        const ethUsdAggregator = await deployments.get("MockV3Aggregator")
        ethUsdPriceFeedAddress = ethUsdAggregator.address
    } else {
        // deploying to an onchain testnet
        ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"]
    }

    const fundMe = await deploy("Fund Me!", {
        from: deployer,
        args: [ethUsdPriceFeedAddress], // put feed address
        log: true,
    })
    log("-------------------------------------------")
}

module.exports.tags = ["all", "fundme"]`

3. 00-deploy-mocks.js

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

    if (developmentChain.includes(network.name)) {
        log("Local Network detected! Deploying mocks... ")
        await deploy("MockV3Aggregator ", {
            contract: "MockV3Aggregator",
            from: deployer,
            log: true,
            args: [DECIMALS, INITIAL_ANSWER],
        })
        log("Mocks Deployed...")
        log("_________________________________________")
    }
}

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

4. MockV3Aggregator.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "@chainlink/contracts/src/v0.6/tests/MockV3Aggregator.sol";

The Error here is : `mac@Dhaniel Hardhat-FundMe % npx hardhat deploy
Nothing to compile
Local Network detected! Deploying mocks... 
deploying "MockV3Aggregator " (tx: 0xe23cf294f06ce056ef3750aba20887a03e6311311e797051e21930f2785cd115)...: deployed at 0x5FbDB2315678afecb367f032d93F642f64180aa3 with 569771 gas
Mocks Deployed...
_________________________________________
An unexpected error occurred:

Error: ERROR processing /Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/deploy/01-deploy-fund-me.js:
TypeError: Cannot read properties of undefined (reading 'ethUsdPriceFeed')
    at Object.module.exports.default [as func] (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/deploy/01-deploy-fund-me.js:16:56)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at runNextTicks (node:internal/process/task_queues:64:3)
    at listOnTimeout (node:internal/timers:533:9)
    at processTimers (node:internal/timers:507:7)
    at DeploymentsManager.executeDeployScripts (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1222:22)
    at DeploymentsManager.runDeploy (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1055:5)
    at SimpleTaskDefinition.action (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat-deploy/src/index.ts:438:5)
    at Environment._runTaskDefinition (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at DeploymentsManager.executeDeployScripts (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1225:19)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at runNextTicks (node:internal/process/task_queues:64:3)
    at listOnTimeout (node:internal/timers:533:9)
    at processTimers (node:internal/timers:507:7)
    at DeploymentsManager.runDeploy (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1055:5)
    at SimpleTaskDefinition.action (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat-deploy/src/index.ts:438:5)
    at Environment._runTaskDefinition (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at SimpleTaskDefinition.action (/Users/mac/Documents/Codes/blockchain-projects/Hardhat-FundMe/node_modules/hardhat-deploy/src/index.ts:584:32)

[alymurtazamemon]

@Night-Prime Please check this line;

ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"]

Here the program is not able to read the value of ethUsdPriceFeed because either chainId or networkConfig is undefined. You should make sure both of these, for chainId you should check you have got it from network.config.chainId and for networkConfig you should check whether you have exported it from the helper file and does the import path is correct.

Check all of these things and your error will be resolved.