Audioscrobbler::nowPlayingError()

[noname043]

Every time when I try to receive Audioscrobbler::nowPlayingError(int, QString) I get qDebug:
QMetaObject::invokeMethod: No such method QApplication::onWsError(lastfm::ws::Error)
"
[message]
" [code]
None of slots connected to nowPlayingError() are invoked.

Here's some code to reproduce: https://gist.github.com/4639108