Cron messages

I am getting the following messages in emails regarding cron jobs. Does
anyone
know how to fix this?

if [ -x /usr/sbin/exim_tidydb ]; then
     /usr/sbin/exim_tidydb /var/spool/exim retry >/dev/null; fi

failed to open DB file /var/spool/exim/db/retry: File exists

and

if [ -x /usr/sbin/exim_tidydb ]; then
     /usr/sbin/exim_tidydb /var/spool/exim wait-remote_smtp >/dev/null; fi

failed to open DB file /var/spool/exim/db/wait-remote_smtp: File exists


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