RangeError: private key length is invalid (In New ETH Transaction pragmatically)

Question

Followed this Ans Ans1 and Ans2 but no solution got.

const web3 = new Web3('https://ropsten.infura.io/v3/3c52917848e945229c0d33d632b10490');

const account1 = '0x0982081d5a2bba0a9da9fe722c92edc0cb0e9b6a'
const account2 = '0xabc46ddc17a0c37ef70e8a153d4724f199705e8b'

const ac1_pvtkey =Buffer.from('XXXX9F79B587B1DE553E2ADCA3DC8D49BE3E2840083D970C41D83F7FD471XXXX');

const ac2_pvtkey =Buffer.from('XXXXC15FBDB4634400B7F8FA17C9491B2E346AEC1BC86A493B18F5759042XXXX');

//build transaction here ---------------------------

 `web3.eth.getTransactionCount(account2, (err, txCount) => {
    const txObject = {
    nonce: web3.utils.toHex(txCount),
    to: account2,
    value: web3.utils.toHex(web3.utils.toWei('0.2','ether')),
    gaslimit: web3.utils.toHex(2100),
    gasPrice: web3.utils.toHex(web3.utils.toWei('10', 'gwei'))
    }

console.log(txObject)

//signing transaction here ---------------------------

const tx = new Tx(txObject);
tx.sign(ac2_pvtkey); //using account2 private key

------------------------- ERROR GIVING ------------------------

var sig = secp256k1.sign(msgHash, privateKey);
                    ^
RangeError: private key length is invalid `

Answer 1

Answer to my question

//Admin's eth Address ------------
const account1 = process.env.ADMIN_ETH_ADDR;
//Admin's eth private key -----------------
const ac1_pvtkey = Buffer.from(process.env.ADMIN_ETH_PVT_KEY, 'hex');

Actual Transaction creation -> signing tx -> serializing tx -> Getting Transaction hash

 var txnCount = web3.eth.getTransactionCount(account1);

      var txObject = {
          nonce: web3.toHex(txnCount),
          gasPrice: web3.toHex(100000000000),
          gasLimit: web3.toHex(140000),
          to: to, //to is ETH address-----
          value: web3.toHex(web3.toWei(amount,'ether')),//amount to be send----
          data: '0xcfa'
      };

      try{

          var transaction = new tx(txObject);
          transaction.sign(ac1_pvtkey);

          var serializedTx = transaction.serialize();

          console.log(serializedTx.toString('hex'));
          transactionId = web3.eth.sendRawTransaction('0x' + serializedTx.toString('hex'));

          console.log(transactionId);

      } catch (e) {
          return console.error(e);
          console.log("Error ETH Transaction ");
      }

Hope this helps. Thanks

Answer 2

Do not use with 'Ox' Remove those in privatekey