Heap corruption Detected Error

I am trying to de allocate the memory i created. However, in the destructor i am getting a Heap coruption Detected Error

In reference to: delete [] items;

I have also tried to comment out the other pointers and it still does it..

Code:

#pragma once

#include <ostream>

using namespace std;

class quack
{
public:
	quack(int capacity);
	~quack(void);
	bool pushFront(const int n);	// push an item onto the front
	bool pushBack(const int n);		// push an item onto the back
	bool popFront(int& n);			// pop an item off the front
	bool popBack(int& n);			// pop an item off the back
	void rotate(int r);				// "rotate" the stored items (see note below)
	void reverse(void);				// reverse the order of the stored items
	int	itemCount(void);			// return the current number of stored items

private:

     int front;
	 int back;
	 int maxsize;
	 int count;
	
	struct item						// definition of each item stored by the quack
	{
		int		n;
	};
	item		*items;	            // pointer to storage for the circular array
	item        *frontPtr;
	item        *backPtr;
	item        *reversePtr;			// pointer to storage for the circular array

public:
	friend ostream& operator<<(ostream& out, quack& q);
	friend ostream& operator<<(ostream& out, quack::item& i);
};

Code:

quack::quack(int capacity): maxsize(capacity+1), front(capacity-2), frontPtr(NULL), backPtr(NULL), 
back(0), count(0), items( new item[capacity])
{


	frontPtr = new item;
	backPtr = new item;
	reversePtr = new item;
	
}



quack::~quack(void)
{
	delete frontPtr;
	delete backPtr;
	delete reversePtr;
	delete [] items;    // causing crash - i have also tried delete items;
   

}

I will attach the error

Some reason i didnt notice that it didnt upload..

nevermind i foud the problem maxsize(capacity+1)
Sorry