I need help understanding this Cron error


Cron <root@domain> test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )


FATAL -> Failed to fork.
run-parts: /etc/cron.weekly/apt-xapian-index exited with return code 100

Ubuntu 14.04 LTS 1GB Ram 1 New Wordpress site

root@domain:~# free -m
             total       used       free     shared    buffers     cached
Mem:           994        922         71         38         79        159
-/+ buffers/cache:        684        309
Swap:            0          0          0

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Generally it’s due to a failed database update or RAM being exhausted when the update took place.

From what I’ve read and experienced, removing it altogether yields no ill effects.

sudo apt-get autoremove --purge apt-xapian-index
sudo apt-get autoremove --purge

What is Xapian?: