friend class compilation error

Hi,
I'm having some strange compilation errors, this code yields message:
acount.cpp(38) : error C2248: 'InvestmentAccount::InvestmentAccount' : cannot access private member declared in class 'InvestmentAccount'
even though account is a friend class.
it happens with the rest of the account concrete classes as well (family ,twoYearssavings).
I can't get what's wrong here.

I'm adding the relevant part

Code:

---


account.h

#ifndef ACCOUNT_H
#define ACCOUNT_H

#include "observer.h"
#include "bank.h"

#include <string>


class AccountImpl; 

class Account:public Observer
{
public:
       
        ~Account();
        static Account* createAccount(Subject* subject, std::string& type, int saving_period, int month,  int year);//factory

        std::string  getAccountType();
        int        getMonth();
        int    getYear();
        int    getSavingPeriod();

       
        void update(Subject* subject)=0;// from bankObserver
        void changeImplementaion( std::string& type);//bridge

protected:
        Account(Subject* subject);

private:
        Subject* getSubject();//get this object's subject (may differ from Bank in the future)

protected:

        AccountImpl* acc_impl;// bridge
};

#endif
///////////////////////
account.cpp

#include <ostream>
#include <iostream>

using namespace std;

#include "account.h"
#include "familyAccount.h"
#include "investmentAccount.h"
#include "twoYearsSavingsAccount.h"
#include "accountImpl.h"



Account::Account(Subject* subject)
{
        subject->attach(this);
}



Account::~Account()
{
        getSubject()->detach(this);
}


Account* createAccount(Subject* subject, std::string& type, int saving_period, int month,  int year)
{
        if(!((saving_period==3)||(saving_period==7)||(saving_period==10)))
                cerr << saving_period << " years: not a legal saving period [3,7,10]\n";

        Account* ptrAcc = 0;

        if(type == "investment")
                ptrAcc = new InvestmentAccount(subject,saving_period,month,year);

        else if(type == "two years savings")
                ptrAcc = new TwoYearsSavingsAccount(subject,saving_period,month,year);

        else if(type == "family")
                ptrAcc = new FamilyAccount(subject,saving_period,month,year);

        return ptrAcc;
}

/* rest of the code, not relevant (i think)*/

////////////////////////////
familyAccount.h

#ifndef FAMILYACCOUNT_H
#define FAMILYACCOUNT_H
#include <iostream>
#include <string>
#include "account.h"
#include "familyAccountImpl.h"

class FamilyAccount:public Account
{
        friend class Account;

public:
        ~FamilyAccount(){}
        void update(Subject* subject)
        {
                std::cout<<"Family account updated...\n";
        }


private:

        FamilyAccount( Subject* subject,int saving_period, int month,  int year):
          Account(subject)
          {
                  acc_impl = new FamilyAccountImpl(subject,saving_period,month,year);
          }


};
#endif

---

There is a mistake in account.cpp:

Code:

---

Account* createAccount(Subject* subject, std::string& type, int saving_period, int month,  int year)

---

should be

Code:

---

Account* Account::createAccount(Subject* subject,
std::string& type, int saving_period, int month,  int year)

---

my bad.
I have been struggling to understand what's wrong and it was right in front of me...
thanks