[vdr] Skinflatplus -Clear Image Cache?

When I start vdr and using the skinflatplus plugin, I see many log entries:

Nov 18 11:23:06 vdr vdr[1639]: [1639] imageloader LoadLogo: /mnt/storage/video/plugins/skinflatplus/logos//kuwait radio 1 obsolete.png could not be loaded Nov 18 11:23:06 vdr vdr[1639]: [1639] imageloader LoadLogo: /mnt/storage/video/plugins/skinflatplus/logos//kuwait - radio quran obsolete.png could not be loaded

I see a reference to an image cache and I assume it is trying to load logos that no longer reside in the logos directory.

How can I clear the cache, (and where is it located)?

Thanks,

Richard