C++ - no operator "<<" matches these operands directory_iterator()

I've copied the example code on the directory_iterator page, so this is what I have:

#include "pch.h" //for visual studios benefit
#include <fstream>
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;

int main()
{
    fs::create_directories("sandbox/a/b");
    std::ofstream("sandbox/file1.txt");
    std::ofstream("sandbox/file2.txt");
    for (auto& p : fs::directory_iterator("sandbox"))
        std::cout << p << '\n'; //this line on the first '<<' is where the error occurs
    fs::remove_all("sandbox");
    return 0; //included by me
}

And the error message is:

Severity    Code    Description Project File    Line    Suppression State
Error (active)  E0349   no operator "<<" matches these operands 

As I'm new to C++ I might have gotten things wrong, but my understanding of the error is basically that p in my case is something which can't be printed out to the console using cout.

The example works if I run it directly on the page so there isn't something wrong with it, which I wouldn't expect either. So question is, why am I seeing this error?

I use the latest version of Visual Studio, along with C++ 2017.