I am new to writing smart contracts. I am having difficulty mint many NFTs in a single function call. Here is my code mint-nft.js:

const API_URL = process.env.API_URL;
const PUBLIC_KEY = process.env.PUBLIC_KEY;
const PRIVATE_KEY = process.env.PRIVATE_KEY;

const { createAlchemyWeb3 } = require("@alch/alchemy-web3");
const web3 = createAlchemyWeb3(API_URL);

const contract = require("../artifacts/contracts/......sol/.......json");
const contractAddress = ".......";
const nftContract = new web3.eth.Contract(contract.abi, contractAddress);

async function mintNFT(tokenURI) {
  const nonce = await web3.eth.getTransactionCount(PUBLIC_KEY, 'latest'); //get latest nonce

  //the transaction
  const tx = {
    'from': PUBLIC_KEY,
    'to': contractAddress,
    'nonce': nonce,
    'gas': 25000000,
    'maxPriorityFeePerGas': 1999999987,
    'data': nftContract.methods.mintNFT(PUBLIC_KEY, tokenURI).encodeABI()

  const signPromise = web3.eth.accounts.signTransaction(tx, PRIVATE_KEY);
  signPromise.then((signedTx) => {

    web3.eth.sendSignedTransaction(signedTx.rawTransaction, function(err, hash) {
      if (!err) {
        console.log("The hash of your transaction is: ", hash, "\nCheck Alchemy's Mempool to view the status of your transaction!"); 
      } else {
        console.log("Something went wrong when submitting your transaction:", err)
  }).catch((err) => {
    console.log("Promise failed:", err);
tokenAddress = "https://gateway.pinata.cloud/ipfs/......................./"
for (i=0; i<10; i++) {

When a function is called, it mints one NFT, and an error occurs longer:

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enter image description here

I hope you'll give me a hand.

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