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

Published by Terlumun Aondover on February 6th, 2025.

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Understanding Ethereum Deployment Errors in Hard Hat

As a developer building projects on the Ethereum blockchain using Hard Hat (formerly Ganache), you are probably not new to smart contract deployment. However, if you encounter an error similar to “expected 0 constructor arguments, got 6,” troubleshooting the issue can be frustrating and difficult.

In this article, we will take a closer look at the cause of this particular error and provide some advice on how to resolve it.

What is the error?

The error message indicates that the Hard Hat deployment script is expecting only one argument (the constructor), even though it is receiving multiple arguments. Instead, you are passing six arguments.

Understanding Constructor Arguments in Solidity

In Solidity, the constructor function is called once, at the beginning of the contract code. Here you can define the contract initialization logic, including setting default values and performing other configuration tasks. The constructor is typically used to initialize the state of the contract with some important information.

Possible causes of the error

Here are some common causes that could cause this error:

Incorrect network configuration: Make sure that the hardhat network in the Hard Hat project is properly configured. This includes configuring the network URL, chain identifier, and other important parameters.

Incorrect argument passed to deploy function: The deploy function is responsible for deploying the contract to a specific network or test network. Double-check that you are passing the correct arguments to this function, including any necessary options (e.g. network, gasLimit, etc.).

Incorrect handling of constructor arguments: Make sure that the Solidity code in the constructor function handles and validates the arguments passed to it correctly.

Troubleshooting Steps

To resolve the error, follow these steps:

Check your Hard Hat configuration

: Check your hardhat.config.js file to make sure it is configuring your network configuration correctly.

Check your deploy function call

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

Review your Solidity code: Check your contract code in the constructor function to make sure it handles and validates the arguments passed correctly.

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

Example code

Here is an example of how you can fix this error by passing fewer arguments to the deploy function:


const {network} = require("helmet");
async function deploy() {
// Configure deployment options here (e.g. gasLimit, network)
const deployment_options = {
// Here you can choose your deployment options...
};
const accounts = await ethers.getSigners();
const deployedContract = await deployContract(deployOptions);
return deployedContract;
}

In this example, we have removed the network argument from the deploy function call. Instead, we create a separate variable for the deployment options and pass it to the deployContract function.

Once you have completed these steps and understood the cause of the error in your Hard Hat deployment script, you should be able to resolve the issue and successfully deploy your contract to Ethereum.