Looks like you are missing a perl module. (FromText.pm) See if you can locate that module on the filesystem, if so call it by full path or modify the env. If the module is not on the system (which seems most likely) then you will need to go to CPAN get the module and install it.
The server admin is defined in your httpd.conf file (in the main config and possibly in any vhost entries you've created).
...snip...
- kkelly [09/Aug/2010:15:48:55 -0500] "GET /xymon-seccgi/bbnote_editor.cgi HTTP/1.1" 500 540
[Mon Aug 09 15:48:55 2010] [error] [client ...] Can't locate HTML/FromText.pm in @INC (@INC contains: /usr/pe
rl5/5.8.4/lib/sun4-solaris-64int /usr/perl5/5.8.4/lib /usr/perl5/site_perl/5.8.4/sun4-solaris-64int /usr/perl5/site_perl
/5.8.4 /usr/perl5/site_perl /usr/perl5/vendor_perl/5.8.4/sun4-solaris-64int /usr/perl5/vendor_perl/5.8.4 /usr/perl5/vend
or_perl .) at /apps/xymon/cgi-secure/bbnote_editor.cgi line 14., referer: http://server/xymon/bb.html
...snip...
Regards,