Error when trying to back up (missing remote files) repair unsuccessful

Hi there! First of, thanks for an amazing product! I’m using Duplicati -

I’m trying to back up my up my home directory (I can backup a subdirectory fine). But when I run it, I get an error saying that there are remote files missing, and that I need to repair. When I click repair, nothing happens, I get the same error when I try to run the backup the next time. I haven’t been able to backup my home directory successfully.

Can someone advise please?