I'm trying to get this linked list project to work, but when I try to run it I get this error:

Lab6 has encountered a problem and needs to close

Lab6 being my project.

Code:

------------------node.h------------------
struct Node
{
int value;
Node *next;
};
class linkedList
{
public:
linkedList() {first=0; length=0;}
bool operator > (int a); //insert an integer at the end of the linked list using the operator new
void displayList(); //display linked list
bool Insert(int i, int a); // insert an integer by creating a new node in the location designated by i
~linkedList();
private:
Node *first;
int length;
};
bool linkedList::operator > (int a)
{
Node *newn, *current;
newn = new Node;
newn->value = a;
newn->next = 0;
current = first;
while (current->next != 0)
current = current->next;
current->next = newn;
length++;
return true;
}
void linkedList::displayList()
{
Node *current;
current = first;
for (int i=0; i<length; i++)
{
current = current->next;
std::cout << current->value;
if ((i+1) < length)
std::cout << ", ";
}
}
bool linkedList::Insert(int i, int a)
{
if ((i > (length+1)) || (i < 1))
return false;
Node *newn, *current;
newn = new Node;
newn->value = a;
current = first;
for (int j=1; j<i; j++)
current = current->next;
newn->next = current->next;
current->next = newn;
length++;
return true;
}
linkedList::~linkedList()
{
Node *current = first;
while (current->next != 0)
{
Node *next = current->next;
delete current;
current = next;
}
delete current;
}
------------------usingnode.cpp------------------
#include <iostream>
#include "node.h"
using namespace std;
int main()
{
linkedList L_int;
L_int.Insert(1,34);
L_int.Insert(1,23);
L_int.Insert(3,12);
L_int.Insert(2,50);
L_int.Insert(1,54);
L_int.Insert(7,11);
L_int.displayList();
return 0;
}

I don't get any errors while compiling, so I'm unsure what to do.