PS3 DLNA Error

[here2rock]

I have a USB drive connected with various media files on it. I have enabled DLNA Media Server in the settings for the router. PS3 is able to see the server and files on it but when I try to access the files I am getting this error message "The folder could not be accessed. This content may been deleted from media server".

I am totally lost.

 

[here2rock]

Just wondering whether built in DNLA server is not compatible with PS3?