Problem with Virtual Folder "Artist"

["Dr. Peter G. Baum" <peter dr-baum net>]

Hi,

I'm still having problems with virtual folders.
/Music/Year and /Music/Album work as expected.
But if I browse into /Music/Artist and then select a folder my control 
point tells me that an error occurred.
Last messages of Rygel 0.20.2 (Fedora on ARM) are

(rygel:1543): MediaExport-DEBUG: 
rygel-media-export-media-cache.vala:498: Parsed filter:  AND (m.class = ? )
(rygel:1543): MediaExport-DEBUG: 
rygel-media-export-media-cache.vala:498: Parsed filter:  AND ((m.class = 
? ) AND (m.author = ? COLLATE CASEFOLD))
(rygel:1543): MediaExport-DEBUG: 
rygel-media-export-media-cache.vala:498: Parsed filter:  AND ((m.class = 
? ) AND (m.author = ? COLLATE CASEFOLD))
(rygel:1543): Rygel-DEBUG: rygel-browse.vala:121: Fetched 30 children of 
container 'virtual-container:03175772d86e56ec01957cbcd43066cf' from index 0.
(rygel:1543): Rygel-DEBUG: rygel-media-query-action.vala:188: searching 
for object 'virtual-container:24741d0fb116c480eda37cdba3a5d61d'..
(rygel:1543): MediaExport-DEBUG: 
rygel-media-export-media-cache.vala:498: Parsed filter:  AND ((m.class = 
? ) AND (m.author = ? COLLATE CASEFOLD))
(rygel:1543): Rygel-DEBUG: rygel-media-query-action.vala:200: object 
'virtual-container:24741d0fb116c480eda37cdba3a5d61d' found.
(rygel:1543): Rygel-DEBUG: rygel-browse.vala:109: Fetching 30 children 
of container 'virtual-container:24741d0fb116c480eda37cdba3a5d61d' from 
index 0..
(rygel:1543): MediaExport-DEBUG: 
rygel-media-export-media-cache.vala:498: Parsed filter:  AND ((m.class = 
? ) AND (m.author = ? COLLATE CASEFOLD))

(rygel:1543): Rygel-WARNING **: Failed to browse 
'virtual-container:24741d0fb116c480eda37cdba3a5d61d': SQLite error 1: no 
such column: m.class


Any idea what's going wrong?

Many thanks,

Peter