Lesson 5 : TypeError: Cannot read properties of undefined (reading 'toHexString')

[shisanjin123]

hi, guys! I'm having this problems:

TypeError: Cannot read properties of undefined (reading 'toHexString')
    at isHexable (/home/ssj/hh-fcc/ethers-simple-storage/node_modules/@ethersproject/bytes/lib/index.js:9:21)
    at arrayify (/home/ssj/hh-fcc/ethers-simple-storage/node_modules/@ethersproject/bytes/lib/index.js:69:9)
    at getPassword (/home/ssj/hh-fcc/ethers-simple-storage/node_modules/@ethersproject/wallet/node_modules/@ethersproject/json-wallets/lib/utils.js:25:33)
    at encrypt (/home/ssj/hh-fcc/ethers-simple-storage/node_modules/@ethersproject/wallet/node_modules/@ethersproject/json-wallets/lib/keystore.js:257:49)
    at Wallet.encrypt (/home/ssj/hh-fcc/ethers-simple-storage/node_modules/@ethersproject/wallet/lib/index.js:210:51)
    at main (/home/ssj/hh-fcc/ethers-simple-storage/encryptKey.js:7:41)
    at Object.<anonymous> (/home/ssj/hh-fcc/ethers-simple-storage/encryptKey.js:14:1)
    at Module._compile (node:internal/modules/cjs/loader:1364:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)
    at Module.load (node:internal/modules/cjs/loader:1203:32)

This is my encryptKey.js

const { ethers } = require("ethers");
const fs = require("fs-extra");
require("dotenv").config();

async function main() {
  const wallet = new ethers.Wallet(process.env.PRIVATE_KEY);
  const encryptedJsonKey = await wallet.encrypt(
    process.env.PRIVATE_KEY_PASSWORD,
    process.env.PRIVATE_KEY
  );
  console.log(encryptedJsonKey);
}

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

This is my .env file

PRIVATE_KEY=6b4dfb6a85880beaa2db832a7dd0d26b16ee8ee9ea1b899f4049e26e80dc84ac
RPC_URL=http://127.0.0.1:7545
PRIVATE_KEY_PASSWPRD=password

And, this is my package.json

{
  "dependencies": {
    "dotenv": "^16.4.5",
    "ethers": "^5.6.2",
    "fs-extra": "^11.2.0",
    "solc": "0.8.8"
  },
  "scripts": {
    "compile": "yarn solcjs --bin --abi --include-path node_modules/ --base-path . -o . SimpleStorage.sol "
  }
}

Who can help me?
I tried adding 0x in PRIVATE_KEY=6b4dfb6a85880beaa2db832a7dd0d26b16ee8ee9ea1b899f4049e26e80dc84ac, but the problem is still there, I also tried changing const fs = require("fs-extra"); toconst fs = require("fs"); It's no use.

[shisanjin123]

my .env file: PRIVATE_KEY_PASSWPRD=password should to write to this PRIVATE_KEY_PASSWORD=password