TypeError: Cannot read property 'addTheirItems' of undefined

[woepertjes]

I'm trying to make a function, which gets called when the specified command is entered.

 

function code:

function tradecases(botid, senderid) {
    var appid = 730;
    var contextid1 = 2;
    
                bots[botid].offers.loadUserInventory(senderid, appid, contextid1, true, (err, theirInv) => {
                if (err) {
                    logger.error(err);
                } else {
                    var theirItem = theirInv
                  bots[botid].offers.offer.addTheirItems({
                      'appid': appid,
                      'contextid': contextid1
                    });

                  bots[botid].offers.offer.setMessage('This is an automated tradeoffer for all your trading cards. You can change it if you want.');
                  bots[botid].offers.offer.send((err, status) => {
                      if (err) {
                          logger.error(err);
                  }     else logger.info('sent offer status: ' + status);
              });
            }
    });
}

Error (error shows up in CMD):

verbose: [B1] Received message from non-botadmin: !casedonate
F:\va\Steam bots\main.js:240
                  bots[botid].offers.offer.addTheirItems({
                                           ^

TypeError: Cannot read property 'addTheirItems' of undefined
    at bots.(anonymous function).offers.loadUserInventory (F:\va\
Steam bots\main.js:240:44)
    at SteamCommunity.<anonymous> (F:\va\node_modules\steamcommun
ity\components\users.js:342:5)
    at Request._callback (F:\va\node_modules\steamcommunity\compo
nents\http.js:67:15)
    at Request.self.callback (F:\va\node_modules\request\request.
js:186:22)
    at Request.emit (events.js:180:13)
    at Request.<anonymous> (F:\va\node_modules\request\request.js
:1163:10)
    at Request.emit (events.js:180:13)
    at IncomingMessage.<anonymous> (F:\va\node_modules\request\re
quest.js:1085:12)
    at Object.onceWrapper (events.js:272:13)
    at IncomingMessage.emit (events.js:185:15)

Could someone maybe give me advice, help, suggestions on how to fix this error?

 

Extra info:

Bots log in perfectly, nothing goes wrong.

Bots are online.

There is a second command like this but that one is meant for steam trading cards. This command has the same issues.

 

All help is appreciated <3

Edited March 20, 2018 by woepertjes

[Dr. McKay]

offers.offer isn't valid. You need to use offers.createOffer which returns an offer object.

[woepertjes]

That worked! Thank you very much! <3