Not a directory: /etc/cron.hourly

Every hour the server send me an e-mail with this text....

"Not a directory: /etc/cron.hourly"

but the directory exists and is empty



the crontab:

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/

# run-parts
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly
01 * * * * root run-parts /etc/cron.hourly
* 10 * * * /usr/bin/ftp http://notirock.rocknica.com/wp-content/plugins/wp-o-matic/cron.php?code=6351cd00
* 10 * * * /usr/bin/ftp http://nicaragua.miwebnica.com/wp-content/plugins/wp-o-matic/cron.php?code=f21dc561