How to use ethereumjs-vm to find the internal transactions for a transaction/block using infura.io

Question

I am using infura.io as my node and trying to get the internal transactions (i.e. transfers initiated by smart contract) for a specific transaction (or its parent block). I have two attempts (both erroring out). It feels like I am missing something basic here.

Some setup code:

const Web3 = require("web3");
const VM = require('ethereumjs-vm');
const Tx = require('ethereumjs-tx');
const blockFromRpc = require('ethereumjs-block/from-rpc');
const web3 = new Web3(new Web3.providers.HttpProvider('https://mainnet.infura.io/' + process.env.INFURA_API_KEY));

const vm = new VM();

When I try this:

web3.eth.getTransaction('0x6b871b7db60454cf97fe7b5d0bb1192f23984e35990dfeeb8df5b9295d0eaaf5')
    .then(tx => {
        web3.eth.getBlock(6189875)
            .then(block => {
                try {
                    vm.runTx({
                        tx: new Tx({
                            ...tx,
                            data: tx.input
                        }),
                        block: blockFromRpc(block)
                    }, function(err, results){
                        console.log('returned: ' + results.logs);
                    });
                }
                catch(e) {
                    const i = e;
                }
            });
    });

I get an error:

The sender does not have enough ether to send this tx

and when I try this:

web3.eth.getBlock(6189875)
    .then(block => {
        try {
            vm.runBlock({
                block: blockFromRpc(block),
                //block
            }, function(err, results){
                console.log('returned: ' + results.logs);
            });
        }
        catch(e) {
            const i = e;
        }
    });

I get an error:

base free exceeds gas limit

Whats going on? I just want to replay the transaction or block so that I can see the internal transactions.

Thanks in advance.