Ethereum: Getting Error “expected 0 constructor arguments, got 6”

Understanding Ethereum Implementation Errors in Hard Hat

As a developer building projects on the Ethereum blockchain using Hard Hat (formerly Ganache), you are probably no stranger to implementing smart contracts. However, when you encounter an error similar to “expected 0 constructor arguments, got 6”, it can be frustrating and difficult to troubleshoot.

In this article, we will explore what causes this specific error and provide guidance on how to resolve it.

What is the error?

The error message indicates that your Hard Hat implementation script expects only one argument (the constructor) when it receives multiple arguments. However, you are passing six arguments instead.

Understanding Constructor Arguments in Solidity

In Solidity, the constructor function is called once at the beginning of your contract code. This is where you define any initialization logic for your contract, including setting default values ​​​​and performing other setup tasks. The constructor is typically used to initialize the state of the contract with some essential information.

Possible causes of error

Here are some common reasons that can cause this error:

• Incorrect network configuration

  

  : Make sure you have correctly configured the hardhat network in your Hard Hat project. This includes setting the network URL, chain ID and other relevant parameters.

• Wrong argument passed to deploy function

  : The deploy function is responsible for deploying your contract to a specific network or testnet. Double-check that you are passing the correct arguments to this function, including any necessary options (eg network, gasLimit, etc.).

• Inadequate handling of constructor arguments: Ensure that your Solidity code in the constructor function correctly handles and validates passed arguments.

Troubleshooting Steps

To resolve the error, follow these steps:

• Check your Hard Hat configuration: Check your hardhat.config.js file to make sure it sets up your network configuration correctly.

• Check your deployment function call: Double-check that you are passing the correct arguments to the deploy function. Make sure you have included all the required options (e.g. network, gasLimit, etc.).

• Review your robustness code: Review your contract code in the constructor function to make sure it is properly handling and validating the arguments passed.

• Use a debugger: Consider using a debugger such as the built-in Hard Hat debugger or external tools such as Remix or Truffle to check the state of your deployed contract and network configuration.

Code example

Here’s an example of how you could fix this error by passing fewer arguments to the deploy function:

const {network} = require ("hardhat");
asynchronous function deploy() {
// Set deployment options here (e.g. gasLimit, network)
const deployOptions = {
// Your deployment options here...
};
const accounts = await ethers.getSigners();
const deployedContract = await deployContract(deployOptions);
return deployedContract;
}

In this example, we’ve removed the network argument from our deploy function call. Instead, we’re setting a separate variable for the deployment options and passing it to the deployContract function.

By following these steps and understanding what’s causing the error in your Hard Hat deployment script, you should be able to resolve this issue and successfully deploy your contract to Ethereum.