Provided address "undefined" is invalid, the capitalization checksum test failed,

Smart Contracts
1

Hi,

I have following script:

var assert = require('assert');
const path = require("path");
     const fs = require("fs");


module.exports = async function(callback) 
{
   try{
     let accounts = web3.eth.getAccounts()

     const acc0 = accounts[0]
     const acc2 = accounts[2];
     acc2bal = await web3.eth.getBalance(acc2);
     web3.utils.fromWei(acc2bal, "ether");
      
           }

catch (error) {
          console.log(error)
       }
   callback();
   
}

I am getting the error:

$ truffle exec mortal2.js
Using network 'development'.

Error: Provided address "undefined" is invalid, the capitalization checksum test failed, or its an indrect IBAN address which can't be converted.
    at Method.inputAddressFormatter (/home/zulfi/.nvm/versions/node/v10.23.3/lib/node_modules/truffle/build/webpack:/node_modules/web3-core-helpers/src/formatters.js:475:1)

I tried the following option:

 //acc2bal = await web3.eth.getBalance(acc2);
 //web3.utils.fromWei(acc2bal, "ether");
 console.log(web3.eth.accounts)

but still, I am not getting the value of accounts[2]

Somebody, please guide me

Zulfi.