Does anyone have experience with Jubler subtitling software? | Jubler not working

Forum: Subtitling
Topic: Does anyone have experience with Jubler subtitling software?
Poster: sakisbrum
Post title: Jubler not working

Hi,
I'm posting this to ask you what to do to fix the problem with Jubler.
I don't know how to start. When I press the button `Test Subtitles from Current Position` a dialog box appears with the message:

Movie Player Error
Abnormal Player Exit
Unable to initialize `MPlayer`
Please make sure `MPlayer` path is properly defined under `Preferences`

Thanks in advance,
Sakis