Please tell me about maillog Error.

I get the following error in maillog：

－－－ dovecot: doveadm(nfsnobody): Error: sync: User init failed dovecot: doveadm(nfsnobody): Error: User initialization failed: Namespace '': mkdir(/var/lib/nfs/Maildir) failed: Permission denied (euid=65534(nfsnobody) egid=65534(nfsnobody) missing +w perm: /var/lib/nfs, dir owned by 0:0 mode=0755) －－－

I am using Dsync and the configuration is below：

－－－ service replicator { process_min_avail = 1 }

dsync_remote_cmd = ssh -l%{login} %{host} doveadm dsync-server -u%u plugin { mail_replica = remote:root@XXX }

service aggregator { fifo_listener replication-notify-fifo { mode = 0777 } unix_listener replication-notify { mode = 0777 } }

service replicator { unix_listener replicator-doveadm { mode = 0600 } }

replication_max_conns = 10

plugin { # When saving a new mail via IMAP or delivering a mail via LDA/LMTP, # wait for the mail to be synced to the remote site. If it doesn't finish # in 2 seconds, return success anyway. # replication_sync_timeout = 2s } －－－

Is the Dsync setting bad? please tell me.