Problem is, I did do what you said. I also did the modification mentioned, now I'm getting this...
Create/Update database for config "/etc/awstats/awstats.conf" by AWStats version 6.95 (build 1.943)
>From data in log file "/var/log/apache2/access.log"...
Error: Couldn't open server log file "/var/log/apache2/access.log" : Permission denied
Setup ('/etc/awstats/awstats.conf' file, web server or permissions) may be wrong.
Check config file, permissions and AWStats documentation (in 'docs' directory).
I do see the file awstats.dethlefsmoreno.com.conf (although nothing was using awstats before my changes to ISPConfig, dethlefsmoreno.com is now.)