When i try to play a midi file, parole says: "Parole necesita audio/x-midi-event decoder para reproducir el archivo. Puede instalarse de modo automático" But when I press install buttons appears: "Los parámetros enviados a la aplicación tienen un formato invalido. Por favor, ¡informe de un error! Los parámetros eran: --transient-for=41943682 gstreamer|1.0|parole|audio/x-midi-event decoder|decoder-audio/x-midi-event"
Have you tried to install the relevant codecs by hand/via your package manager? The plugin-install system in Parole has always been a bit buggy, we'll hopefully be able to tackle that in a later release.
I don't think we'll ever fix the plugin installer (patches welcome).