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我在函数中发布了一个curl post请求：curl代码：

std::string MakePost(std::string site, std::string login, std::string password, bool IsMessage, bool IsName) {
std::string arr[] = { "username", login, "password", password };
std::string headers = GetHeaders(arr, 2);
std::string readBuffer;
std::string toSend = (IsMessage ? ("message=") : (""));
toSend = (IsName ? ("name=") : (toSend));
toSend += headers;
int status = -1;
CURL* curl;
CURLcode res;
std::string response;
std::string url = site;
std::string data = toSend;
curl_global_init(CURL_GLOBAL_ALL);

curl = curl_easy_init();

if (curl) {
    curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
    curl_easy_setopt(curl, CURLOPT_POST, 1);
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data.c_str());
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, wc);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);

    res = curl_easy_perform(curl); 

    if (res != CURLE_OK)
    {
        std::cout << "request failed to " << site << toSend << std::endl;
        curl_easy_cleanup(curl);
        return std::string("request failed to") + site + toSend;
    }

}
curl_easy_cleanup(curl);
return response;
}

操作：Visual Studio 2019错误截图：error screenshot
项目中还包括第三方库：iostream，字符串，cstdio，cstdlib，fstream，curl/curl. h我的错误是什么？