Synology,DS station playlist with minimserver

[Meffy]

Hello everyone, im new here and i hope someone could help me with a problem i have. I have a synology nas DS412+ and i have created some playlists with audio station (.m3u). Now on my Xperia(android) i use bubbleupnp as a controll point to push my music from all my DLNA servers (e.g. Synology,minimserver) to my oppo 105.Everything works as it should.Now i have import the directory from my synology that contains my audio station playlist i have created,some mp3 playlists and some flac format playlists to minimserver.When i choose synology server on bubbleupnp and play those playlists it does indeed plays all the formats mp3 and flac playlist.When i choose minimserver and try to play those playlists then it only plays those playlist that are mp3 but not those that are created in flac playlists.I get an error on bubbleupnp "No Item Found In The Direct-Sub_Folders Of The Sellected Folder(s)".Do i miss something?
BTW, when i browse the folders that contains FLAC files within minimserver it plays them just fine(on my oppo).It only doesnt play them in playlist.

I hope someone can help me.

Thanks in advance.
Regards Meffy