/etc/rc.conf: 18: Syntax error: Unterminated quoted string

[Jose Borquez]

I just recently did a make buildworld, make buildkernel, make install 
kernel, make installworld, and mergemaster in that order.  When I login 
as root I get the following email message:

Subject: Cron <operator at daemon> /usr/libexec/save-entropy
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <PATH=/etc:/bin:/sbin:/usr/bin:/usr/sbin>
X-Cron-Env: <HOME=/>
X-Cron-Env: <LOGNAME=operator>
X-Cron-Env: <USER=operator>

/etc/rc.conf: 18: Syntax error: Unterminated quoted string

I checked my etc/rc.conf file and it is all correct.  Here it is:
ifconfig_tx0="inet 172.16.1.6  netmask 255.255.0.0"
moused_enable="YES"
moused_type="auto"
sshd_enable="YES"
usbd_enable="YES"
ntpd_enable="YES"
enable_quotas="YES"
check_quotas="NO"
clear_tmp_enable="YES"                  # YES has to be in capital letters
ipfilter_enable="YES"                   # Start ipf firewall
ipfilter_rules="/etc/ipf.rules"         # loads rules definition text file
ipmon_enable="YES"                      # Start IP monitor log
ipmon_flags="-Ds"                       # D = start as daemon

Everything seems to be working properly.  I did a ps and top and they 
worked.  Can anybody please enlighten me as to what this message means?
Thank you in advance,
Jose