Error when calling the contract: LESSON 5 ETHERS

[ghost]

Hi, when i wrote this below code and ran it using node

const ethers = require("ethers");
const fs = require("fs");

// we can only use await keyword inside async functions

async function main() {
  const rpcURL = "http://127.0.0.1:7545";
  const provider = new ethers.providers.JsonRpcProvider(rpcURL);

  const wallet = new ethers.Wallet(
    "0xd3ff6e741deb110873fe5e8b51bd204f1de0fde2508102c986089389fbace67f",
    provider
  );

  const tx = {
    to: "0x9bBC28112B173246C18C3cE3345C5B4eb422a03a",
    value: ethers.utils.parseEther("0.1"),
    gasLimit: 21000,
  };

  const abi = fs.readFileSync("./SimpleStorage_sol_SimpleStorage.abi", "utf-8");

  const binary = fs.readFileSync(
    "./SimpleStorage_sol_SimpleStorage.bin",
    "utf-8"
  );

  const contractFactory = new ethers.ContractFactory(abi, binary, wallet);
  console.log("Deploying, please wait...");
  const contract = await contractFactory.deploy(); // STOP here, wait for the contract to deploy
  console.log(contract);
}

main()
  .then(() => process.exit(0))
  .catch((err) => {
    console.error(err);
    process.exit(1);
  });

Error:

Error: cannot estimate gas; transaction may fail or may require manual gas limit

Can you please help me out here
Thanks.