Local Administrator group is missing on 1 of our ZFSSA clusters

One of our clusters is being inundated with the following errors:

Apr 29 17:36:21 filer smbd[1713]: [ID 783751 daemon.error] smb_lgrp_getsid: no such domain SID

Apr 29 17:36:21 filer smbd[1713]: [ID 817528 daemon.error] smb_lgrp_iterate: database operation error

Apr 29 17:36:21 filer smbd[1713]: [ID 783751 daemon.error] smb_lgrp_getsid: no such domain SID

Apr 29 17:36:21 filer smbd[1713]: [ID 817528 daemon.error] smb_lgrp_iterate: database operation error

I found an article referencing these on ZFS/solaris, so I ran the shell commands:

smbadm show-groups:

1 error(s) occurred while retrieving group data.

Check the system log for more information.

backup operators (Members can bypass file security to back up files)