I recently started getting this too (an e-mail every 5 minutes since yesterday), but I've had awstats running for nearly a year, and have never seen this.
It simpy said:
Could not open /var/log/httpd/awstats/
www.thegeekhouse.comI've tried touching that filename, to see if it just couldn't write to that file, and I've tried makdir'ing that directory, both with no results.