Priority Queue out of bounds

[catdance]

I have a priority queue being used to store my bid objects for an item (class requirement). For some reason, I'm getting an error that says expression: vector iterator not dereferencable when it comes to printing my second item object (case 5 in switch on main program). This was working before I added the bid queue. It seems straightforward to me. I have no idea how this is happening.

// item class
#ifndef H_ITEMS
#define H_ITEMS
#include <iostream>
#include <string>
#include <list>
#include <queue>
#include <iomanip>
#include "customers.h"
#include "date.h"
#include "bids.h"
using namespace std;

class Item
{
public:
	Item();
	Item(int, int, int, int, int, int, int, 
		int, int, int, int, int, string, double);
	void setItem(int, int, int, int, int, int, int, 
		int, int, int, int, int, string, double, double, bool);
	int getItemIDd();
	string getItemName();
	double getPrice();
	bool getisSold();
	double getTotalCommission();
	double getCommission();
	double getHighestBid();

	void AddtoBids(Bid &);
	void itemSold(int, int, int, int, int, double, const double COM_PER);
	void findItem(int, bool &);
	bool BidisEmpty();
	void CalculateTotalCommission();

	void printCustomersItems();
	void printItemsForSale();
	void printItemsSold();
	void printItemsAndBiddingList();
	void isCustomerItem(int, bool &);

	//friend bool operator<(const Bid &, const Bid &);

private:
	int itemID;
	int cID;
	string itemName;
	double openingPrice;
	bool isSold;
	Date listDate;
	Date endDate;
	double commission;

	static double totalCommission;
	priority_queue <Bid> bidQueue;
};
#endif

Item::Item(int y, int m, int d, int h, int min, int ey, int em, int ed, int eh, int emin,
	int id, int cId, string i, double p):
	listDate(y, m, h, d, min), endDate(ey, em, ed, eh, emin)
{

	itemID = id;
	cID = cId;
	itemName = i;
	openingPrice = p;
	isSold = false;
	commission = 0;
}


void Item::setItem(int ly, int lm, int ld, int lh, int lmin, 
	int ey, int em, int ed, int eh, int emin, int id, int cId, string i, double p, double c, bool s)
{
	itemID = id;
	cID = cId;
	itemName = i;
	openingPrice = p;
	listDate.setDate(ly, lm, ld, lh, lmin);
	isSold = s;
	commission = c;
	cout << "set Item commission " << commission << endl;
	endDate.setDate(ey, em, ed, eh, emin);
}

// bids are added from a separate file. I've checked this and it works

void Item::AddtoBids(Bid &temp)
{
	cout << temp.getItID() << " " << temp.getBid() << endl;
	bidQueue.push(temp);
}


//   Here is the print function that gives me the error

void Item::printItemsForSale()
{
	Bid sTemp = bidQueue.top();
	cout << "Item ID: " << itemID << endl;
	cout << "Name of item: " << itemName << endl;
	cout << fixed << setprecision(2);
	cout << "Opening Price: $" << openingPrice << endl;
	cout << "Current highest bid: $" << sTemp.getBid() << endl;
	
}

// bid class

#ifndef H_BIDS
#define H_BIDS
#include<iostream>
#include<queue>
#include "date.h"
using namespace std;

class Bid
{
public:

	Bid();
	Bid(int, int, int, int, int, int, int, double);
	void setBid(int, int, double, int, int, int, int, int);
	int getItID();
	int getcustID();
	double getBid();
	friend bool operator<(const Bid &, const Bid &);

private:
	int itID;
	int custID;
	double bid;
	Date bidDate;

};
#endif

Bid::Bid()
{
	itID = 0;
	custID = 0;
	bid = 0;
	bidDate.setDate(0, 0, 0, 0, 0);
}

Bid::Bid(int y, int m, int d, int h, int min, int i, int c, double b):
	bidDate(y, m, d, h, min)
{
	itID = i;
	custID = c;
	bid = b;
}

void Bid::setBid(int i, int c, double b, int y, int m, int d, int h, int min)
{
	itID = i;
	custID = c;
	bid = b;
	bidDate.setDate(y, m, d, h, min);
}


double Bid::getBid()
{       return bid;       }

bool operator<(const Bid &right, const Bid &left)
{
	return  (right.bid < left.bid);
}

#include <iostream>
#include <string>
#include <list>
#include <iomanip>
#include <fstream>
#include<queue>
#include "customers.h"
#include "date.h"
#include "items.h"
#include "bids.h"
using namespace std;

void createItemList(fstream&, list<Item> &);
void createCustomerList(fstream&, list<Customer> &);
void createBidQueue(fstream&, list<Item> &, list<Item>::iterator &, list <Bid> &, list <Bid>::iterator &);

void findCustomer(int cid, list<Customer> &, list<Customer>::iterator &, bool &); 
void findItem(int id, list<Item> &, list<Item>::iterator &, bool &); 

void enterNewCustomer(list<Customer> &, list<Customer>::iterator &);
void enterNewItem(list<Item> &, list<Item>::iterator &, list<Customer> &, list<Customer>::iterator &);
void enterNewBid(list<Item> &, list<Item>::iterator &, list<Customer> &, list<Customer>::iterator &);

void enterCustomerID(int &);
void enterTime(int &, int &, int &, int &, int &, int &, int &, bool &);
void displayMenu();

const double COM_PER = 0.1;
double Item::totalCommission = 0;

int main()
{
	list <Item> itemList;
	list <Item>::iterator i;
	list <Customer> customerList;
	list <Customer>::iterator c;
	list <Bid> bidList;
	list <Bid>::iterator b;

	char ch;
	int choice, cid;          
	bool found;

    fstream itemfile, custfile, bidfile;

            //open the customers file
    custfile.open("customers.txt");
    if (!custfile)
    {
        cout << "The customer file does not exist. "
             << "This program will terminate." << endl;
//		system ("pause");
        return 1;
    }

        //create the Customer list
    createCustomerList(custfile, customerList);


          //open the items file
    itemfile.open("bidItems.txt");
    if (!itemfile)
    {
        cout << "The items for bidding file does not exist. "
             << "This program will terminate." << endl;
        return 1;
    }
				//create the Bid list
	createItemList(itemfile, itemList);

         //open the bids file
    bidfile.open("bids.txt");
    if (!bidfile)
    {
        cout << "The bidding file does not exist. "
             << "This program will terminate." << endl;
        return 1;
    }
				//create the Item list
	createBidQueue(bidfile, itemList, i, bidList, b);

			// Start of menu
	displayMenu();
    cout << "Enter your choice: ";
    cin >> choice;    
    cin.get(ch);
    cout << endl;

        //process the requests
    while (choice != 9)
    {
 		bool cfound = false, customerItem=false;
		int x = 0, y = 0;
       switch (choice)
        {
		case 1:		//enter new customer
			enterNewCustomer(customerList, c);
			break;

		case 2:		//enter new item
			enterNewItem(itemList, i, customerList, c);
			break;
			
		case 3:  //change to add a bid

			enterNewBid(itemList, i, customerList, c);
			break;

			// need a case to end bidding

        case 4:	  //list items for sale of a particular customer
			do
			{
				cout << "\nEnter Customer ID of seller: ";
				cin >> cid;
				findCustomer(cid, customerList, c, cfound);
				if (!cfound)
				{
					cout << "Customer ID is not valid.\n";
					x++;
				}
			}while (!cfound && (x < 3));

			if (cfound)
			{
				c->printCustomer();
				for (i=itemList.begin(); i!=itemList.end(); ++i)
				{
					i->isCustomerItem(cid, customerItem);
					if(customerItem)
					{
						if (!(i->getisSold()))
						{
							i->printCustomersItems();
							y++;
						}
					}
				}
			}
			else
				cout << "Too many errors.\n\n";

				if ((cfound) && (y == 0))
					cout << "Customer has no items for sale.\n\n";
	
			break;

		case 5:		// print all items for sale
			
			for (i=itemList.begin(); i!=itemList.end(); ++i)
			{
				if(!(i->getisSold()))        //exclude sold items
					i->printItemsForSale();
			}
			break;


		case 6:    // print all items sold

			for (i=itemList.begin(); i!=itemList.end(); ++i)
			{
				if(i->getisSold())
	 			    i->printItemsSold();
			}
			break;

		case 7:   // list of items with their bids

			for (i =itemList.begin(); i!=itemList.end(); ++i)
			{
				i->printItemsAndBiddingList();
					
			}

		default:
			cout << "Invalid selection.\n\n";
		}	// end switch

		if (choice != 9)
		{
			displayMenu();     //display menu
			cout << "Enter your choice: ";
			cin >> choice;     //get the next request
			cin.get(ch);
			cout << endl;
		}	// end switch

	}		// end while


	custfile.close();
    itemfile.close();
	bidfile.close();
	system("pause");
	return 0;
}

[catdance]

Nevermind, I just found it. Forgot to check if the priority queue was empty.