npx hardhat run scripts/deploy.js --network localhost is not working. It says

TypeError: Cannot read properties of undefined (reading 'JsonRpcProvider')

My deploy script

const hre = require("hardhat");

async function main() {
  const ChatApp = await hre.ethers.getContractFactory("ChatApp");
  const chatApp = await ChatApp.deploy();
  await chatApp.deployed();
  console.log(`Contract Address: ${ChatApp.address}`);

  .catch((error) => { 
    console error(error);
    process.exitCode = 1;

1 Answer 1


Try downgrading "ethers" to version 5.4 in your package.json, then delete your node_modules folder and finally run "npm install" again.

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