Cannot delete library

I created a library (I was testing something). Now I don’t need the library but when I select it and choose Delete I get the dialog with the “yes, I want to delete this library” so I check it and click the delete button. It chugs… but does not delete.

I don’t think this matters but I’m using the latest release on a Qnap TVS-871.

Thoughts?

Plex server Version 1.12.2.4929