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McKay Development

[Help]Error in module file during sending offer

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When I send offer i get error: "callback is not a function" in steam-tradeoffer-manager/lib/helpers.js in 45 line.

That is my code:

function sendOffer(customer, bot, customerItems, botItems) {

  var botInventory = manager.getUserInventoryContents(customer, 753, 6, true, function(err, inventory, currencies) {
    return inventory;
  var customerInventory = manager.getUserInventoryContents(bot, 753, 6, true, function(err, inventory, currencies) {
    return inventory;

  var Exchange = manager.createOffer(customer);
  var message = "Thank You for trading with me. Here's your cards. This offer expires in 10 minutes.";

  var ExchangeBot = GetExchangeItems(botInventory, botItems);
  var ExchangeUser = GetExchangeItems(customerInventory, customerItems);


  Exchange.send(message, 'Dh58A2w', function(err, status) {
    console.log('Exchange ID:' + Exchange.id + ' send: ', status);

And I have second question. How to send offers to friends without token?

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