QNetworkRequest invalid parameter passed to C runtime function issue

 QUrl url;
 url.setUrl("https://test.com/test_link.php");
 QUrlQuery urlQuery;
 urlQuery.addQueryItem("test1", value1);
 urlQuery.addQueryItem("test2", value2);
 QNetworkAccessManager *netManager = new QNetworkAccessManager(this);
 QNetworkRequest request(url);
 request.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("application/x-www-form-urlencoded"));
 netManager->post(request, urlQuery.toString(QUrl::FullyEncoded).toUtf8());
 connect(netManager, &QNetworkAccessManager::finished, [this, netManager](QNetworkReply *reply) {
     qDebug() << reply->bytesAvailable();
     reply->close();
     reply->deleteLater();
     netManager->deleteLater();
 });