const fs = require('fs').promises
var [pairA, pairB] = require('./pairs.json')
const StellarSdk = require('stellar-sdk')
StellarSdk.Network.useTestNetwork()
const server = new StellarSdk.Server('https://horizon-testnet.stellar.org')
const accountA = server.loadAccount(pairA.publicKey).then(function(i){
return i
})
let transaction = new StellarSdk.TransactionBuilder(accountA)
.addOperation(StellarSdk.Operation.createAccount({
destination: "GBNVD6L2GKXWIOEDW44VHHPPHOLXOUQZR6BWRUXHELDVLJ4LG6NJ2II5",
startingBalance: "2.5000000"
}))
.addMemo(StellarSdk.Memo.text('Test Transaction'))
.build();
transaction.sign(pairA.publicKey);
return horizonServer.submitTransaction(transaction);
var sequenceNumber = new BigNumber(this.source.sequenceNumber()).add(1); error