It's the server version.
I left the Container Volume as /config and my Host Path is /mnt/user/Programs/unRAID/appdata/Calibre/
I haven't changed libraryinternalpath
If the host path is a cache only share, can you try changing that to /mnt/cache/Programs/unRAID/appdata/Calibre/ ?
Also, since it's the server version, did you have an existing calibre library at that location or did you add books through command line? If there was an existing library, do the calibre versions of the library creator and this new server match?
Thanks. The host path is not a cache only share.
I was using an existing library with a different Calibre version. I will try adding directly from the command line.