Subtitles addon not working

[Muertomatao]

Hi there.

I have latest xbian version installed.
I have the RPi connected via ethernet and a mouse and a HDD on the usb.

When i play a video, I can't download subtitles for it.
I just click the subtitles icon, get the window saying that I have no subs plugin installed and I click to install one.
Then, a window just opens and closes instantly.

Is there any way to solve this?

I've been googling for 2h but didn't find a clue.

Thank you!