Ethereum: Hardhat throw Error: yParity mismatch (argument=”signature”, …… ) when i try to deploy smartcotnract in sepolia testnet

Ethereum Hardhat Throw Error: yParity Mismatch

As a developer working on Ethereum-based projects, you may encounter a hardhat throw error when deploying smart contracts to the SEPOLIA test network. This article will guide you through troubleshooting and resolving this issue.

What is a Hardhat Throw Error?

A hardhat throw error occurs when a task in your Hardhat configuration fails or encounters an unexpected condition that prevents it from executing successfully. These errors can be challenging to resolve, especially for new developers.

Hardhat Throw Error: yParity Mismatch (argument=”signature”, etc.)

The given error message is quite specific and suggests a problem with the yParity library in Hardhat. Here’s a breakdown of what the error might mean:

• Hardhat throw error: This indicates that there is an issue within the hardhat configuration that needs to be addressed.

• yParity mismatch: This suggests that the yParity library, which is likely being used for smart contract deployment, has encountered an inconsistency or mismatch with the expected behavior.

• (argument="signature", etc.): These are additional details within the error message.

Troubleshooting Steps

To resolve this issue, follow these steps:

Step 1: Verify yParity Installation

Make sure that the yParity library is installed correctly and up-to-date. Run:

npm install yparity

or

yarn add yparity

If you’re using a custom implementation, ensure it’s compatible with Hardhat.

Step 2: Check Hardhat Configuration

Review your Hardhat configuration file (hardhat.config.js) to verify that the yParity library is being used correctly. Specifically, check for any errors or warnings related to yParity.

// hardhat.config.js

module.exports = {

  // Other configurations...

  async deploy() {

    const { network } = await getNetwork();

    const ethers = require('ethers');


    try {

      const deployScript = await loadScript(

        import yparity from '@y parity/core';

        console.log(yparity);

        // Your deployment script here

);


      const provider = new ethers.providers.JsonRpcProvider(network.address, network.version);

      const deployedContract = await deployScript.provider call({

        data: {

          address: '0x...',

        },

        encoding: 'json',

        numInputs: 1,

        args: [],

        value: ethers.utils.parseEther('1'),

        gasPrice: ethers.constants.GAS_price,

      });


      console.log(Deployed contract address: ${deployedContract.address});

    } catch (error) {

      console.error(error);

    }

  },

};

Step 3: Review Hardhat Scripts

Double-check your deployed scripts (scripts/deploy.js) to ensure they’re correct and match the expected behavior.

Step 4: Test Deployment on SEPOLIA Testnet

Once you’ve resolved any issues with yParity, try deploying your smart contract on SEPOLIA test network using alchemy API:

npx hardhat run scripts/deploy.js --network sepolia

If the issue persists, consider reaching out to the Hardhat community or the SEPOLIA support team for further assistance.

Conclusion

The yParity mismatch error in Hardhat can be challenging to resolve. By following these troubleshooting steps and reviewing your configuration files, you should be able to identify and fix the issue. If you’re still experiencing issues, don’t hesitate to seek help from the community or experts in the field.

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