Q: cacti migration from server to another

[nemesis]

Have cacti running fine on a RH9 server (A), apache, mysql, php, etc.
Want to have a backup server (B), so installed a Centos, but using
XAMPP (apache+mysql+php+perl), so I would not need to config
each component. Then exported cacti db from (A), and imported
into (B), all trees, devices, etc. show up, log-in accounts work too.
Then copied all *rrd files from (A) and to (B), but graphs do not show up.

The htdoc directory on (A) is /var/www/html/cacti
and on (B) is /opt/lampp/htdocs/cacti

Checked "Data Sources", and turned on "Data Source Debug Mode",

/usr/local/bin/rrdtool create \
/opt/lampp/htdocs/cacti/rra/ux_ccsapp01_28.rrd \
--step 300 \

Seems to have auto adjusted to new directory correctly.

Had successfully migrated to another RH9, with individually
installed components, importing cacti db and copying rrd files.

Any suggestions? How do I get cacti to generate error message so
I know what/why/where it's having problem?