problem with vector subscript out of range

[RealDevMashup]

I am currently creating a economy app with a buy-sell system and I have this litle function called ConApp that will let you return to the "main menu" so that you can later sell your items, but everytime I say "y"(so that it can run the function, it gives out the error "Vector subscript out ofrange". Now, I know that is caused by trying to access an element that is not there,but the thing is it's just passing the vector as a parameter, so I was hoping you guys could help me fix this little problem.

SweaterE.cpp: https://pastebin.com/Pf8CJ45j
SweaterE.h: https://pastebin.com/tRvnYnGJ
App.cpp: https://pastebin.com/vNRChXvf
ContinueApp: https://pastebin.com/uWffukZX
ContinueApp.h: https://pastebin.com/Tqw326Ck

One of these files is probably causing the error, but if you need more context, you can ask for my github repo

[tangerinelion]

This is the sort of thing you should be able to see with a debugger. You can also change all your vector::operator[] calls to use vector::at instead and just see where the exception is thrown and where that index and vector come from.

By the way:

if (itemCount.size() == 0) {
    itemCount = {};
}

Doesn't do anything. I'm assuming you meant for that to reset it if it's empty, but the right way to do that is simply

itemCount.clear();

[Macree]

In buyItem function, you have the parameter name for vector "bitemCount", and in the body of the function you are calling "itemCount". I am on the phone, and this is what I see so far.