Lesson 7: TypeError: Cannot read properties of undefined (reading 'length')

[SquilliamX]

I am in lesson 7 and I ran "yarn hardhat deploy --tags mocks" and received an error. Can anyone help me solve this error?

Repo: https://github.com/SquilliamX/Hardhat-Fund-Me

Error:

$ yarn hardhat deploy --tags mocks
yarn run v1.22.19
warning package.json: No license field
$ /home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/.bin/hardhat deploy --tags mocks
Nothing to compile
Local network detected! Deploying Mocks...
An unexpected error occurred:

Error: ERROR processing /home/smartchain/code/foundry-f23/hardhat-fund-me/deploy/00-deploy-mocks.js:
TypeError: Cannot read properties of undefined (reading 'length')
    at getFrom (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat-deploy/src/helpers.ts:1640:14)
    at fetchIfDifferent (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat-deploy/src/helpers.ts:827:34)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at _deployOne (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat-deploy/src/helpers.ts:905:24)
    at DeploymentsManager.executeDeployScripts (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1214:19)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at DeploymentsManager.runDeploy (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1060:5)
    at SimpleTaskDefinition.action (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat-deploy/src/index.ts:447:5)
    at Environment._runTaskDefinition (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:358:14)
    at Environment.run (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:191:14)
    at SimpleTaskDefinition.action (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat-deploy/src/index.ts:598:32)
    at Environment._runTaskDefinition (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:358:14)
    at Environment.run (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:191:14)
    at SimpleTaskDefinition.action (/home/smartchain/code/foundry-f23/hardhat-fund-me/node_modules/hardhat-deploy/src/index.ts:687:5)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

00-deploy-mocks.js:

const { network } = require("hardhat")
const {
    developmentChains,
    DECIMALS,
    INITIAL_ANSWER,
} = require("../helper-hardhat-config")

module.exports = async ({ getNamedAccounts, deployments }) => {
    const { deploy, log } = deployments
    const { deployer } = await getNamedAccounts()
    if (developmentChains.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"]

[SquilliamX]

Please help

[SquilliamX]

I was able to narrow it down to my hardhat deploy. My hardhat-deploy node modules has many errors in it. Can anyone help me solve this problem? My package.json was copied from Patrick's package.json.

I have also tried to delete it all and re-install all dependencies but nothing is working. Does anyone have any advice?

[MariossoKN]

Hey.

This error is probably caused because you are didnt defined namedAccounts in your hardhat.config.js. It should look like this:

module.exports = {
    // solidity: "0.8.8",
    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
    },
    defaultNetwork: "hardhat",
    networks: {
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 11155111,
        },
    },
    namedAccounts: {
        deployer: {
            default: 0,
        },
    },
}

[Sanskar-khandelwal]

Answer is:

use this in your hardhat.config.js

 namedAccounts: {
    deployer: {
      default: 0,
    },
    user: {
      default: 1,
    },
  }

or use the await keyword if not already added here:

const { deployer } = await getNamedAccounts()

[SamsShow]

i tried both the things but it is still showing the same error

[Naddaa2000]

fixed?

[SamsShow]

yes