Passport Pro, Plex says not enough space, but i have 3TB left

it says it has no space available, it wont upload custom posters or even connect to the server, matching is disabled. is there a limit on how much custom posters can you upload?

I know that this is an older post but thought I would share my solution to this problem.

I had this happen before. What I ended up having to do was to Restore Factory Settings using the “System Only” option in the http://mypassport/UI/

I guess that somehow some of the Plex databases got corrupted. After doing this I had to rescan all the library files but once everything was scanned, trash emptied, bundles emptied and database optimized…no more issues.