Using Box Drive Version 2.38.165 (macOS)
Box is complaining that it isn't able to sync 19 items - most of them are due to 'The file path is invalid on this system'. When I looked further into it, I found that I had a trailing space at the end for most of them. I have fixed that - however, that doesn't seem to do anything.
I've tried using the 'Retry All' button, which clears the list for a couple of minutes. But, the same error comes back.
I've tried logging out and back into Box app.
If it helps, I ended up changing the name of the problematic folder. e.g. from 'Original Name ' to 'New Name'