Lesson 7: I DIDN'T KNOW HOW TO FIX THIS ERROR

[LRay-iu]

const { network } = require("hardhat");
const hre = 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;
log(network.name);
if (chainId == 31337) {
log("--------------------------------------------------------");
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"];

---

I check for several times,and i didn't understand what the meaning of this error:

the version of hardhat and hardhat-deploy: "hardhat": "^2.20.1", "hardhat-deploy": "^0.12.1"
If MY PROBLEM is not clear enough, I can add it.

[LRay-iu]

COMPLETE TERMINAL INFORMATION:
$ D:\study_test\Hardhat\Fundme\node_modules.bin\hardhat deploy --tags mocks
Nothing to compile
hardhat

Local network detected!Deploying mocks...
An unexpected error occurred:

Error: ERROR processing D:\study_test\Hardhat\Fundme\deploy\00_Mock.js:
TypeError: Cannot read properties of undefined (reading 'length')
at getFrom (D:\study_test\Hardhat\Fundme\node_modules\hardhat-deploy\src\helpers.ts:1643:14)
at fetchIfDifferent (D:\study_test\Hardhat\Fundme\node_modules\hardhat-deploy\src\helpers.ts:830:34)
at processTicksAndRejections (node:internal/process/task_queues:95:5)
at _deployOne (D:\study_test\Hardhat\Fundme\node_modules\hardhat-deploy\src\helpers.ts:908:24)
at DeploymentsManager.executeDeployScripts (D:\study_test\Hardhat\Fundme\node_modules\hardhat-deploy\src\DeploymentsManager.ts:1214:19)
at processTicksAndRejections (node:internal/process/task_queues:95:5)
at DeploymentsManager.runDeploy (D:\study_test\Hardhat\Fundme\node_modules\hardhat-deploy\src\DeploymentsManager.ts:1060:5)
at SimpleTaskDefinition.action (D:\study_test\Hardhat\Fundme\node_modules\hardhat-deploy\src\index.ts:450:5)
at Environment._runTaskDefinition (D:\study_test\Hardhat\Fundme\node_modules\hardhat\src\internal\core\runtime-environment.ts:358:14)
at Environment.run (D:\study_test\Hardhat\Fundme\node_modules\hardhat\src\internal\core\runtime-environment.ts:191:14)
at SimpleTaskDefinition.action (D:\study_test\Hardhat\Fundme\node_modules\hardhat-deploy\src\index.ts:601:32)
at Environment._runTaskDefinition (D:\study_test\Hardhat\Fundme\node_modules\hardhat\src\internal\core\runtime-environment.ts:358:14)
at Environment.run (D:\study_test\Hardhat\Fundme\node_modules\hardhat\src\internal\core\runtime-environment.ts:191:14)
at SimpleTaskDefinition.action (D:\study_test\Hardhat\Fundme\node_modules\hardhat-deploy\src\index.ts:690:5)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[LRay-iu]

After I redeployed the whole project, the problem seems to have been solved, although it is still unclear what happened before, but the problem is solved, thats okay