I have the same problem since the last update. Can you tell me how you have configured that new shared folder to work? I have tried to create a new one and I get the same error. Edit: solved! It was a problem with the destiny folder advanced permissions. It's working again

Solved, I've got it.

After add https://get.filebot.net/syno/ in package origins, FileBot, Filebot Node, Java Updater, don't appear in Package Center