undefined reference to `Mosaic::Mosaic()' - c++

Question

Error in terminal of VS Code:
/tmp/ccU4qzPn.o: In function main':
azul.cpp:(.text+0xa7e): undefined reference toMosaic::Mosaic()'
azul.cpp:(.text+0xa86): undefined reference to `Mosaic::printMosaic()'
collect2: error: ld returned 1 exit status*
azul.cpp
#include "Mosaic.h"
#include <iostream>
// int menuOption;
std::string playerOne;
std::string playerTwo;
void printMenu() {
std::cout << " " << std::endl;
std::cout << "*-*-*-*-*-*-*-*-*-*-*-*-*-*-*" << std::endl;
std::cout << "| |" << std::endl;
std::cout << "| Welcome to Azul |" << std::endl;
std::cout << "| |" << std::endl;
std::cout << "*-*-*-*-*-*-*-*-*-*-*-*-*-*-*" << std::endl;
std::cout << "| ----------- |" << std::endl;
std::cout << "| Main Menu |" << std::endl;
std::cout << "| ----------- |" << std::endl;
std::cout << "| 1. New Game |" << std::endl;
std::cout << "| 2. Load Game |" << std::endl;
std::cout << "| 3. Credits |" << std::endl;
std::cout << "| 4. Help |" << std::endl;
std::cout << "| 5. Quit |" << std::endl;
std::cout << "| |" << std::endl;
std::cout << "*-*-*-*-*-*-*-*-*-*-*-*-*-*-*" << std::endl;
std::cout << " " << std::endl;
}
int main(void) {
printMenu();
std::cout << "Enter Your Choice: " << std::endl;
char menuOption;
std::cin >> menuOption;
if (menuOption == '1') {
std::cout << "\n\nStarting a new game..." << std::endl;
std::cout << "\nEnter Name for Player One:" << std::endl;
std::cin >> playerOne;
std::cout << "\nEnter Name for Player Two:" << std::endl;
std::cin >> playerTwo;
std::cout << "\n\nLet's play!\n" << std::endl;
std::cout << "-----------" << std::endl;
std::cout << "Start Round" << std::endl;
std::cout << "-----------" << std::endl;
std::cout << "\nMosaic for " << playerOne << ":" << std::endl;
Mosaic* mosaic = new Mosaic();
mosaic->printMosaic();
}
return EXIT_SUCCESS;
};
Mosaic.cpp
#include "Mosaic.h"
#include <iostream>
Mosaic::Mosaic(){
}
Mosaic::~Mosaic(){
}
void Mosaic::printMosaic() {
for (int i = 1; i < 6; i++)
{
std::cout << i << ". ";
for (int j = 6; j > i; j--)
{
std::cout << " ";
}
for (int j = 0; j < i; j++)
{
std::cout << ".";
}
std::cout << "|| . . . . ." << std::endl;
}
}
Mosaic.h
class Mosaic
{
public:
Mosaic();
~Mosaic();
void printMosaic();
};
I think the problem is at the pointer
Mosaic* mosaic = new Mosaic();