Lesson 5 : when i put my key in .env, deploy.js does not works

[wilonweb]

Hello
I'm on Lesson 5 at 7:32:52
When I place my private key in the .env file, deploy.js is not workin

When i launch node.js with my privateKey write directly in the file the deployment working.
But when i install yarn add dotenv

and than i type require("dotenv").config(); in the deploy.js file
And i replace my privateKey with

let wallet = new ethers.Wallet(process.env.PRIVATE_KEY, provider);

And than i put my PRIVATEKEY=0x95... in the .env file
When i launch deploy.js the output is :

TypeError: Cannot read property 'toHexString' of undefined
    at isHexable (/home/wilfried/smartContract/JS/etherJS/node_modules/@ethersproject/bytes/lib/index.js:9:21)
    at hexlify (/home/wilfried/smartContract/JS/etherJS/node_modules/@ethersproject/bytes/lib/index.js:175:9)
    at new SigningKey (/home/wilfried/smartContract/JS/etherJS/node_modules/@ethersproject/signing-key/lib/index.js:20:82)
    at new Wallet (/home/wilfried/smartContract/JS/etherJS/node_modules/@ethersproject/wallet/lib/index.js:120:36)
    at main (/home/wilfried/smartContract/JS/etherJS/deploy.js:11:16)
    at Object.<anonymous> (/home/wilfried/smartContract/JS/etherJS/deploy.js:42:1)
    at Module._compile (node:internal/modules/cjs/loader:1092:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1121:10)
    at Module.load (node:internal/modules/cjs/loader:972:32)
    at Function.Module._load (node:internal/modules/cjs/loader:813:14)

This is my deploy.js file

const ethers = require("ethers");
const fs = require("fs");
require("dotenv").config();

async function main() {
  // compile
  // http://127.0.0.1:7545
  let provider = new ethers.providers.JsonRpcProvider(
    "http://172.26.128.1:7545"
  );
  let wallet = new ethers.Wallet(process.env.PRIVATE_KEY, provider);
  const abi = fs.readFileSync("./SimpleStorage_sol_SimpleStorage.abi", "utf8");
  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 contract to deploy!
  const transactionReceipt = await contract.deployTransaction.wait(1);

  let currentFavoriteNumber = await contract.retrieve();
  console.log(currentFavoriteNumber.toString());
}

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

[alymurtazamemon]

@NinjaTurtles-cloud

PRIVATEKEY=0x95... as you have mentioned, please write the exact same name that you wrote in the deploy.js file

[wilonweb]

O yeah, i had forgotten the _ ...
Thanks again !!!