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error C2512 but i have default constructor available

Reza Agha (2)
my code have error (error C2512: 'Node' : no appropriate default constructor available) but i have default constructor why ??? my error location commented in code in stat.h Please help me

Node.h
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#pragma once
#include "stat.h"
#include "Automata.h"
#include <cstdlib>

class Node
{
    friend class Automata;
    friend class stat_a;
    friend stat_a* makeauto(char *str);
    friend int main();
private:
    stat_a* mess;
    char data;//harfi ke ba in masir estefadeh mishe :)
    Node *next;//node badi dar araye node ha class stat_a :)
public:
    Node()
    {
        mess = NULL;
        next = NULL;
    };
};


stat.h

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#pragma once
#include "Node.h" 
#include <iostream>

using namespace std;
class stat_a
{
    friend class Automata;
    friend class Node;
    friend int main();
private:
    bool is_final_stat_a;        //aya final stat_a hast ???
    int  stat_a_num;              //shomareh halat 0,1,2,...
    Node *last;                  //akharin node dar araye node haye neshan dahande masir
    Node *first;                //Avalin node dar araye node haye neshan dahande masir
public:
    void add(char d,stat_a * a)//ezafeh kardan masiri ke ba estefadeh
    {                       //az harf (char d ) be halat (stat_a a) miravad
        if(first == NULL)
        {
            first = new Node;//error is here
            first->data = d;
            first->mess = a;
            last=first;
        }
        else
        {
            last->next = new Node ;//erorr is here
            last=last->next;
            last->data=d;
            last->next=NULL;
            last->mess=a;
        }
    };

    /***********************************************************************/

    void print()
    {
        cout<<stat_a_num<<"========> is final_stat_a : "<<is_final_stat_a<<endl;
        Node *a;

        a=first;
        while(a != NULL)
        {
            cout<<"========> By '"<<a->data<<"' go to stat "<<a->mess->stat_a_num<<endl;
            a=a->next;
        }
    };

    stat_a()
    {
        last=NULL;
        first=NULL;
        is_final_stat_a=false;
    };

    ~stat_a(void);
};
Reza Agha (2)
i have find this problem.
the problem is circular dependency
coder777 (8444)
the problem is that you #include "Node.h" in "stat.h" and "stat.h" in "Node.h"

I suggest that you remove line 2 of "Node.h"
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