Using playlists with BubbleUpnp

[ste]

I want to store some playlists on my server. I use
bubbleupnp as player. The only way whitch works until now is this kind
of path:

http://x.x.x.x:yyyy/minimserver/*/data/Musik/Jazz/abc/Coltrane,*20John/A*20Love*20Supreme/01*20part*201*20-*20acknowledgement.flac

When I omit the http part, bubble shows an empty folder and minimserver
writes an error to the log (Error: playlist Musik/Playlists/test.m3u8:
no content directory for /data/Musik...). When I omit the blank masking,
bubble shows an error (wrong character) and minimserver is ok.

What's my mistake?