liboping error operation not allowed

I wrote such a function, used liboping linux, gives an error, maybe someone knows how to fix

        QString msg;

        pingobj_t *pingobj = ping_construct();

        if (pingobj == nullptr)
          {
            msg = "Error: ";
            msg += ping_get_error(pingobj);
          }
          ui->textEdit->setText(msg);

        int timeout = 3;
        for (;;)
          {
            double timeout_sec = ((double)timeout)/(double)(1000.0);

            if (ping_setopt(pingobj, PING_OPT_TIMEOUT, &timeout_sec))
              break;

            if (ping_host_add(pingobj, ui->lineEdit->text().toStdString().c_str()))
              break;

            if (ping_send(pingobj) <= 0)
              break;

            res = true;

            break;
          }


        if(res)
          ui->textEdit->setText("Yes");
        else
          {
            msg = "Error: ";
            msg += ping_get_error(pingobj);
            ui->textEdit->setText(msg);
          }

        ping_destroy(pingobj);