Disk assisted memory queues in rsyslog causinerror starting up disk queue, using pure in-memory mode

Rsyslog version: 8.4.2
Queue type: Disk assisted Memory Queue

Almost 380 servers send several OS and application logs to the log aggregation server in my case.
Error on one of the servers:
rsyslogd-2026: error starting up disk queue, using pure in-memory mode

NOTE: This is not happening on all servers.

Configuration:
$WorkDirectory /var/lib/rsyslog # where to place spool files
$ActionQueueFileName SIEMForward # unique name prefix for spool files
$ActionQueueMaxDiskSpace 1g # 1gb space limit (use as much as possible)
$ActionQueueSaveOnShutdown on # save messages to disk on shutdown
$ActionQueueType LinkedList # run asynchronously
$ActionResumeRetryCount -1 # infinite retries if host is down
authpriv.*,local2.*,local4.*,local5.*,local6.*,local7.*,cron.*,*.info,mail.*,uucp,news.crit @@xxxxxx-AGG-SERVER:10514

Could someone please help me resolve this issue.

Thanks in advance.