Cron wont create new graphs

[Guest]

SunOs

5,10,15,20,25,30,35,40,45,50,55 * * * * php /usr/local/apache/htdocs/html/cacti-0.6.8a/cmd.php

when cron execute that the graphs wont update
when I execute the command as root the graphs update fine.
Whats the issue?

[fruers]

What permissions do you have set on the <path_cacti>/rra directory? The user that is running the cron job needs to be able to write to it, you can test from the command line by su-ing to the proper user and running cmd.php