(Answer) (Category) WebGUI FAQ : (Category) Troubleshooting :
Do this first!
go into /data/WebGUI/sbin and type: 
 perl preload.perl
It will definitely tell you what's WebGUI-specific (including perl modules) wrong with your install.

If you get 

 Starting WebGUI (version)
   webgui.conf
   anothersite.conf (optional)
 WebGUI started Successfully!

You're on the right track. Don't forget that httpd-error.log will tell you nice other stuff. Oh, and ... yes, if webgui.log is filling up, you probably should address those issues as well. Those issues are usually "bad things" that are related either to real bugs or something you did bad with the install.

If the error message says, "Maybe you didn't load perlcategory::perlmodule", you might like to try to install the missing thing (again) with CPAN. Don't forget... upgrading Perl (5.6 to 5.8, eg) may necessitate upgrading or re-installing CPAN modules.
wg-fomATgwyDOTorg

This is not valid with 7.x+
wg-fomATgwyDOTorg
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