
error ! when i install the Plugin Architecture .....

i think my problem is simple,hehe ~~~
i download the Plugin Architecture at this websit and follow the Readme document.
1.i copyed everything in files-0.8.6g to my cacti, /usr/local/www/htdoc/cacti
2.i modify the include/config.php for dbname & user name& passwd
that's all.
but i found my cacti web is someting wrong.
there are many error :
Notice: Undefined index: url_path in /usr/local/www/htdocs/cacti/lib/html.php on line 446
that just one , here still many~~~
i dont know why~ who can give a help? thx