Today when i want tu schedule a new playlist, i have the message 
Error populating CcFiles object [wrapped: Trying to access array offset on value of type bool]
So I can’t schedule any playlist now ! and it’s a very bid problem.
Update: I find the problem: in some playlists I schedule some dynamic blocks for adverts. The error come each time this blocks for adverts are empty (and scheduled). After deleting the blocks in playlists, there is no error message.
I thought to delete this post but if it can be useful for someone, it’s good to know.
Patrick