Ethereum: TypeError: Cannot read properties of undefined (read ‘0’) while running `yarn hardhat deployment`

Ethereum Hardhat Error: TypeError cannot read properties of Undefined

As a web3 developer, it is not uncommon to encounter errors when working with the Ethereum blockchain using tools like Hardhat. In this article, we will address a common issue related to implementing hardhat on Node.js that is often encountered by new users.

Error Message: TypeError: Cannot read properties of Undefined (read ‘0’)

When you run ‘yarn hardhat deploy’, your project should compile and deploy your smart contracts successfully. However, if you encounter the following error message:

TypeError: Cannot read properties of undefined (read '0')

this indicates that there is a problem with the way Hardhat handles the deployment process.

Why this error occurs

The TypeError: Cannot Read Properties of Undefined error occurs when Hardhat tries to access the 0th index of an array or object, but it does not exist. In your case, this could be related to how you are using the deploy function of the hat.

Solution 1: Check your deployment code

A possible cause of this error is that your deployment code is not configuring the deployment environment correctly. Here are a few things to check:

• Make sure your hardhat.config.js file is configured correctly, including the networks and deployer settings.

• Make sure your deploy function is called with the correct arguments.

Here is an example of what your code might look like. deployment:

module.exports = {
// ... other configurations ...
networks: {
mainnet: {
accounts: [
"0x1234567890123456789012345678901234567890",
"0x98765432109876543210987654321098765432109876543210"
],
gas: 200000,
Gas price: 20
}
},
distributor: {
network: "mainnet",
// ... other settings...
},
async deploy() {
await this.deployed();
return this.state;
}
};

Solution 2: Use the ethers library

Another possible cause of this error is that you are trying to access an undefined object. In your case, it could be related to the use of the ethers library.

To fix this issue, make sure you have installed and imported the ethers.js library correctly:

const ethers = require('ethers');
// ... other code ...

You can also try to initialize ethers globally in your project’s package.json file:

`dependencies: {
@nomiclabs/ethers: ^5.2.0,
// ... other dependencies ...
}

Solution 3: Check your hardhat configuration

Hardhat has a configuration system that allows you to customize the deployment process. Here are a few things to check:

• Make sure yourhardhat.config.jsfile is configured correctly, including any custom settings or overrides.

• Make sureethersProvideris configured correctly.

To fix this issue, make sure you have initialized ethers correctly in your main project file:

import * as ethers fromethers;
const provider = new ethers.providers.Web3Provider(window.ethereum);
const networkId = window.ethereum?.chainId;
// ... other code ...

By checking these possible solutions and testing them, you should be able to resolve the TypeError: Cannot Read Properties of Undefined` error when deploying your hardhat smart contracts.

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