Heap corruption detected

I don't know what I am doing, but I would like someone to help me on this.

I am trying to build a default constructor by using the initializer list, and I am getting this error.

HEAP CORRUPTION DETECTED: after Normal block(#126) at 0x003C5060. CRT detected that the application wrote to memory after end of heap buffer.

I believe the error could be on these following modules.

Code:

class list
{
public:
... ...

private:
	struct node
	{
		// constructor
		node(const winery& winery);
		
		winery item;
		node * nextByName;
		node * nextByRating;
	};

	node * headByName;
	node * headByRating;

Code:

//constructor

list::list() :
headByName(NULL),
headByRating(NULL),
myHead(NULL),
myTraverser(NULL)

{
}

//destructor

list::~list()
{
	delete headByName;
	headByName = NULL;
	delete headByRating;
	headByRating = NULL;
	delete myHead;
	myHead = NULL;
	delete myTraverser;
	myTraverser = NULL;

}

But I'd rather send you guys the entire code so that I can avoid any confusions, and for you to test it and know what I'm talking about.

lab1.zip - File Shared from Box.net - Free Online File Storage

Look at the number in () - #126

Now read this
How to use _crtBreakAlloc to debug a memory allocation

This will stop in the debugger just as you allocate that block. You can then follow it through to see where you're overwriting the end of it.