Problem with .mkv and .srt subtitles

[timzz]

So I'm trying to play .mkv format movie with subtitles but whenever I open the subtitle file (.srt), it just throws an error at me. I went to my PC and tried it and it worked Any suggestions what could it be?

Edit: Cant remember the error message exactly because it was yesterday at my girlfriends place and in finnish but I think it was something like "cant load movie.srt" or something. The movie is in 720p.

[Soju Ninja]

Make sure the .SRT filename is exactly the same as the video filename (minus the extension) and is in the same folder as the video file.