c++/cli error C2143: syntax error : missing ';' before '.' - c++-cli

Question

High, guys! Sorry to ask you this question, but I can´t find what causes the error. Also, I'm new at Visual C++/CLI, so I know my code could use some polishing.
In short, what I'm trying to do is capture data from a form to build a class.
I'd appreciate any help. THANKS IN ADVANCE.
My code:
// Form4A.h
#pragma once
# include "Tutors.h"
namespace SisPro
{
//.... more code
public ref class Form4A : public System::Windows::Forms::Form
{
#pragma region Windows Form Designer generated code
//.... more code
#pragma endregion
private: System::Void button4_Click(System::Object^ sender, System::EventArgs^ e)
{
String ^ m1 = comboBox14->SelectedItem->ToString();
String ^ m2 = comboBox19->SelectedItem->ToString();
String ^ m3 = comboBox20->SelectedItem->ToString();
Tutors.add_tutor(m1, m2, m3);// ERROR C2143
}
};
}
SOMWHERE ELSE:
//Tutors.h
using namespace System;
public ref class Tutors
{
public:
Tutors();
void add_tutor(String ^ m1, String ^ m2, String ^ m3)
private:
String ^ ID;
String ^ LASTNAME;
String ^ NAME;
};
// tutors.cpp
#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include "Tutores.h"
Tutors::Tutors()
{
ID = "";
LASTNAME = "";
NAME = "";
}
void Tutors::add_tutor(String ^ m1, String ^ m2, String ^ m3)
{
ID = m1;
LASTNAME = m2;
NAME = m3;
return;
}

Answer 1

Add field Tutors in class Form4A. And add field initialization in constructor.
public ref class Form4A : public System::Windows::Forms::Form
{
#pragma region Windows Form Designer generated code
//.... more code
Form4A()
{
//..
this->Tutors = gcnew Tutors();
}
#pragma endregion
Tutors^ Tutors;
private: System::Void button4_Click(System::Object^ sender, System::EventArgs^ e)
{
String ^ m1 = comboBox14->SelectedItem->ToString();
String ^ m2 = comboBox19->SelectedItem->ToString();
String ^ m3 = comboBox20->SelectedItem->ToString();
Tutors.add_tutor(m1, m2, m3);// ERROR C2143
}
};