Sarkurd 0 Junior Poster in Training

Hi
I have tried to implement Linked-List data structure and i was folowing a guide but i have an error in line 12 in contactlist.h
I have included contact.h properly but still not working :-/

contact.h

#ifndef CONTACT_H
#define CONTACT_H

#include <iostream>
#include <string>
#include "contactlist.h"

class Contact
{
private:
    std::string name;
    Contact *next;
public:
    friend class ContactList;
    Contact(std::string);

    std::ostream& operator<<(std::ostream& output);
};

#endif // CONTACT_H

contactlist.h

#ifndef CONTACTLIST_H
#define CONTACTLIST_H

#include <iostream>
#include <string>
#include "contact.h"

class ContactList
{
private:
    int size;
    Contact *head; // The error is here
public:
    ContactList();
    void AddtoHead(const std::string &n);
};

#endif // CONTACTLIST_H

contact.cpp

#include "contact.h"

Contact::Contact(std::string _Name = "Default Name"): name(_Name), next(NULL)
{}

 std::ostream& Contact::operator<<(std::ostream& output){

     return output<<this->name<<std::endl<<"Next Node: "<<this->next<<std::endl;
 }

contactlist.cpp

#include "contactlist.h"
#include "contact.h"

ContactList::ContactList(): head(NULL), size(0)
{}

void ContactList::AddtoHead(const std::string &n)
{
    Contact *NewNode = new Contact(n);

    if(head == NULL)
        head = NewNode;
    else
    {
        NewNode->next = head;
        head = NewNode;
    }

}

Error

C:\Users\*****\Documents\Qt Creator\Projects\Linked-List\contactlist.h:12: error: 'Contact' does not name a type
     Contact *head;
     ^
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