LR Mobile - Some Photos In Unedited Folder

Hi, I'm away travelling and have been saving raw files to my Android tablet and editing them with LR mobile. All of them re visible in Gallery but when I select the LightRoom option they are split between "All Photos" (the vast majority) and "Unedited" (30 photos). I don't seem to be able to do anything with these 30 photos - clicking on them results in the dreaded "failed to load development version" message and I can't work out how to get them into the All photos folder a nd be able to edit them. I'm not aware I did anything with these photos for them to be separated into this "Unedited " folder.

Help would be much appreciated 

Regards

Paul Aroney