serial
);
- optional<string> error = get_from_url (url, true, false, boost::bind (&DownloadCertificatePanel::load_certificate, this, _1));
+ auto error = get_from_url (url, true, false, boost::bind (&DownloadCertificatePanel::load_certificate, this, _1, _2));
if (error) {
_dialog->message()->SetLabel(wxT(""));
error_dialog (this, std_to_wx(*error));