Error with **Pointers in classes

Question

I'm working on a program which is required to use a pointer to pointer type of variable. I'm getting some error-messages from Visual Studio that I can't interpret and need help to figure out.

I have the following classes:

(Filename: Yatzee.h)
#pragma once
#include <string>
#include <iostream>
#include "ProtocolColumn.h"

using namespace std;

class Yatzee
{
public:
    Yatzee();
    Yatzee(int nrOfPlayer);
    ~Yatzee();
    void addPlayer(string name);


private:
    string name;
    int nrOfPlayers;
    ProtocolColumn **ptr;
    void initiate();
    void free();

};

(Filename Yatzee.cpp)
#include "Yatzee.h"
Yatzee::Yatzee()
{
    this->nrOfPlayers = 1;
    this->ptr = new ProtocolColumn*[1];
    this->initiate();
}

Yatzee::Yatzee(int nrOfPlayers)
{
    this->nrOfPlayers = nrOfPlayers;
    this->ptr = new ProtocolColumn*[this->nrOfPlayers];
    this->initiate();
}

void Yatzee::initiate()
{
    for (int i = 0; i < this->nrOfPlayers; i++)
    {
        this->ptr[i] = nullptr;
    }
}

void Yatzee::free()
{
    for (int i = 0; i < this->nrOfPlayers; i++)
    {
        delete this->ptr[i];
    }

    delete[] this->ptr;
}

Yatzee::~Yatzee()
{
    this->free();
}

(Filename: ProtocolColumn.h)
#pragma once
#include <string>
#include <sstream>

using namespace std;

class ProtocolColumn
{
public:
    ProtocolColumn();
    ProtocolColumn(string name);
    ~ProtocolColumn();

    bool addResult(int diceValue, int result);
    string getPlayerName()const;
    int getSum()const;
    bool isFilled()const;
    string toString()const;

private:
    string name;
    int sum;
    int *resultDice;
    bool *visited;
    void initiateProtocol();

};


(Filename: ProtocolColumn.cpp)
#include "ProtocolColumn.h"
ProtocolColumn::ProtocolColumn()
{
    this->name = "Joe Doe";
    this-> sum = 0;
    this->initiateProtocol();
}

ProtocolColumn::ProtocolColumn(string name)
{
    this->name = name;
    this->sum = 0;
    this->initiateProtocol();
}

ProtocolColumn::~ProtocolColumn()
{

}

//Initiate array for the protocol
void ProtocolColumn::initiateProtocol()
{
    this->resultDice = new int[6];
    this->visited = new bool[6];

    for (int i = 0; i < 6; i++)
    {
        resultDice[i] = 0;
        visited[i] = false;
    }
}

bool ProtocolColumn::addResult(int diceValue, int result)
{   
    bool res = false;
    if (diceValue < 7 && diceValue > 0 && visited[diceValue-1] == false)
    {
        this->resultDice[diceValue-1] = result;
        this->visited[diceValue - 1] = true;
        this->sum += result;
        res = true;
    }
    return res;
}

string ProtocolColumn::getPlayerName() const
{
    return this->name;
}

int ProtocolColumn::getSum() const
{
    return this->sum;
}

bool ProtocolColumn::isFilled() const
{
    bool isAllFilled = false;

    for (int i = 0; i < sizeof(visited); i++)
    {
        if (visited[i]==true)
        {
            isAllFilled = true;
        }
        else
        {
            isAllFilled = false;
        }
    }

    return isAllFilled;

}

string ProtocolColumn::toString() const
{
    stringstream ss;
    ss << this->getPlayerName() + "\n";
    for (int i = 0; i < 6; i++)
    {
        ss << i+1 << "\t :  " << this->resultDice[i] << endl;
    }
    ss << "--------------------\n";
    ss << "SUM =       " << this->getSum() << endl;

    return ss.str();
}

Every function here is not complete. But my problems lies in the pointer in the Yatzee.h file called ProtocolColumn **ptr. When I try to initiate it in the constructor I get these error codes from Visual Studio:

• C2143 - Syntax error missin ";" before'*'
• C4430 - Missing type specifier - int assumed
• C2238 - Unspecified token(s) preceding ';'

All errors is in the Yatzee.h file and I can understand why I get them. I'm just trying to initiate my **pointer so that I can point to a ProtocolColumn object also.