UnhandledPromiseRejectionWarning: Error: Returned error: execution reverted

Here's the code I'm running to get the balance of the contract I've previously deployed to Binance Smart Chain:

let Web3 = require('web3');
const fs = require('fs');

let web3 = new Web3('https://data-seed-prebsc-1-s1.binance.org:8545');

const contractAddress = '0x43045f0Cec750eEb70478B023885d1956588438E';
const contractAbi = JSON.parse(fs.readFileSync("scripts/contract_abi.json").toString())
const contract = new web3.eth.Contract(contractAbi, contractAddress);

contract.methods.balanceOf(contractAddress).call().then(result=>console.log(result)).catch(err => console.log(err));

This code throws me the error:

Error: Returned error: execution reverted
at Object.ErrorResponse (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/web3-core-helpers/lib/errors.js:28:19)
at /home/zuber/Projects/HelloBSC/HelloCoin/node_modules/web3-core-requestmanager/lib/index.js:303:36
at XMLHttpRequest.request.onreadystatechange (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/web3-providers-http/lib/index.js:98:13)
at XMLHttpRequestEventTarget.dispatchEvent (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/xhr2-cookies/dist/xml-http-request-event-target.js:34:22)
at XMLHttpRequest._setReadyState (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/xhr2-cookies/dist/xml-http-request.js:208:14)
at XMLHttpRequest._onHttpResponseEnd (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/xhr2-cookies/dist/xml-http-request.js:318:14)
at IncomingMessage.<anonymous> (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/xhr2-cookies/dist/xml-http-request.js:289:61)
at IncomingMessage.emit (events.js:387:35)
at endReadableNT (internal/streams/readable.js:1317:12)
at processTicksAndRejections (internal/process/task_queues.js:82:21) {
data: null}

The contract is copypasted from https://github.com/binance-chain/bsc-genesis-contract/blob/master/contracts/bep20_template/BEP20Token.template (only added onlyOwner modifier to line 332)

Truffle config used to deploy contract to BSC:

const HDWalletProvider = require('@truffle/hdwallet-provider');
const fs = require('fs');
const mnemonic = fs.readFileSync(".secret").toString().trim();

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 8545,            // Standard BSC port (default: none)
      network_id: "*",       // Any network (default: none)
    },
    testnet: {
      provider: () => new HDWalletProvider(mnemonic, `https://data-seed-prebsc-1-s1.binance.org:8545`),
      network_id: 97,
      confirmations: 10,
      timeoutBlocks: 200,
      skipDryRun: true
    },
    bsc: {
      provider: () => new HDWalletProvider(mnemonic, `https://bsc-dataseed1.binance.org`),
      network_id: 56,
      confirmations: 10,
      timeoutBlocks: 200,
      skipDryRun: true
    },
  },

  // Set default mocha options here, use special reporters etc.
  mocha: {
    // timeout: 100000
  },

  // Configure your compilers
  compilers: {
    solc: {
      version: "0.5.16", // A version or constraint - Ex. "^0.5.0"
    }
  }
}

This is a general error originating from a smart contract, when the contract throws an unhandled exception.

Even though that you didn't post the contract source code, we can get some basic info about its content from the decompiled code.

It shows that there's no balanceOf() (that you're trying to call), and that the fallback() (which is used if you're trying to call an non-existing function) always throws an exception.

From here, the most likely possibility is that you meant to deploy a different contract (that contains the balanceOf() function) but mistakenly deployed this one instead.

Or if you meant to get the BNB balance (not the token balance) of the contract address, you can use the web3 getBalance() method. Example:

const balance = await web3.eth.getBalance(contractAddress);