TypeError: Cannot read property 'length' of undefined

[OIU2020]

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

module.exports = async ({ getNamedAccounts, deployments }) => {
  const { deploy, log } = deployments;
  const { deployer } = await getNamedAccounts(); 
  const chainId = network.config.chainId; 
  // If we are on a local develohelppment network, we need to deploy mocks!
  if (chainId == 31337) {
    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'];

---

npx hardhat deploy --tags mocks

Nothing to compile
Local network detected! Deploying mocks...
An unexpected error occurred:

Error: ERROR processing E:\PatrickSolidity\hardhat-fund-me\deploy\00-deploy=mocks.js:
TypeError: Cannot read property 'length' of undefined

[0xrishavsharma]

Hi there,
It is a GREAT question ⚡️

Can you please look into your config and confirm if "nameAccounts" property have the following values?
If it doesn't please paste them in your hardhat.config.js

namedAccounts: {
        deployer: {
            default: 0, // here this will by default take the first account as deployer
            1: 0, // similarly on mainnet it will take the first account as deployer. Note though that depending on how hardhat network are configured, the account 0 on one network can be different than on another
        },
    },

You can also checkout the answer to similar question at: #69
Let me know if this works or not 😊

If it doesn't works, please share the whole error which shows up in your terminal.

[OIU2020]

Thank you very much for your help！
Add this code and it works

I originally thought that this config function was used when there were multiple accounts, so I deleted it

I think the code of this lesson is a little difficult to understand,
It seems that I have a little psychological resistance to get the price locally