vk api - json - Ошибка C2589 (: недопустимая лексема справа от "::"

#include <iostream>
#include "src/api.h"
#include "src/json.hpp"
#include "curl/curl.h"
//#include "nlohmann/json.hpp"
#include <windows.h>
using json = ::nlohmann::json;
using namespace std;
 
 
string fa2_callback() {
    string res;
    cout << "Enter 2fa code: ";
    cin >> res;
    return res;
}
 
string captcha_callback(const string &captcha_sid) {
    string res;
    cout << "Open image https://api.vk.com/captcha.php?sid=" << captcha_sid;
    cout << " and enter text: " << endl;
    cin >> res;
    return res;
}
 
void print_man() {
    cout << "Usage: [access_token] login pass" << endl;
}
 
int main(int argc, char *argv[]) {
    if(argc < 2 || argc > 4) {
        print_man();
        return 1;
    }
    string login = "897****0050";
    string pass = "Poz****";
    string access_token = "32b016db4f9************************1ee04b7edfd8c984ef3ed7fbcb08d9d";
 
    if(argc == 2) {
        access_token = argv[1];
    } else if(argc == 3) {
        login = argv[1];
        pass = argv[2];
    } else if(argc == 4) {
        access_token = argv[1];
        login = argv[2];
        pass = argv[3];
    } else {
        print_man();
        return 1;
    }
 
 
    VK::Client api;
    api.set_fa2_callback(fa2_callback);
    api.set_cap_callback(captcha_callback);
    if(api.auth(login, pass, access_token)) {
        cout << "Auth ok" << endl;
        cout << "Access token: " << api.access_token() << endl;
        
        VK::params_map params = {
            {"owner_id", "id44400533"},
            {"message", "Hello from VK API"}
        };
        cout << "API response: " << endl;
        cout << api.call("wall.post", params) << endl;
 
        api.call("wall.post", "owner_id=id44400533&message=Hello from VK API");
        
    } else {
        cout << "Auth fail: " << api.last_error() << endl;
    }
 
    return 0;
}

#define NOMINMAX
 
 
#include <iostream>
#include "src/api.h"
#include "src/json.hpp"
#include "curl/curl.h"
//#include "nlohmann/json.hpp"
#include <windows.h>

#include <algorithm>

#define NOMINMAX
#include <iostream>
#include <windows.h>
#define CURL_STATICLIB
#include "curl/curl.h"
#include <src/api.h>
#include "src/json.hpp"