Runs fine, yet nothing

[Bateau]

Cacti wont work,
the graphs don show, and i dont think it runs anything.
i think maybe it can be a problem with the cron, but i dont know what

[Bateau]

where the graphs are suposed to be, it just says:
Localhost - CPU Usage (magnifying glass)

this is the error the debug tools gives me:

(localHost)
RRDTool Says:
ERROR: opening '/usr/share/cacti/site/rra/localhost_5min_cpu_8.rrd': No such file or directory

(A server)
Data Query Debug Information
+ Running data query [8].
+ Found type = '6 '[script query].
+ Found data query XML file at '/usr/share/cacti/site/resource/script_server/host_disk.xml'
+ XML file parsed ok.
+ Executing script for list of indexes '/usr/bin/php -q /usr/share/cacti/site/scripts/ss_host_disk.php 172.18.0.15 public 1 3 index'
+ Executing script query '/usr/bin/php -q /usr/share/cacti/site/scripts/ss_host_disk.php 172.18.0.15 public 1 3 query index'
+ Executing script query '/usr/bin/php -q /usr/share/cacti/site/scripts/ss_host_disk.php 172.18.0.15 public 1 3 query description'
+ Executing script query '/usr/bin/php -q /usr/share/cacti/site/scripts/ss_host_disk.php 172.18.0.15 public 1 3 query sau'
+ Found data query XML file at '/usr/share/cacti/site/resource/script_server/host_disk.xml'
+ Found data query XML file at '/usr/share/cacti/site/resource/script_server/host_disk.xml'
+ Found data query XML file at '/usr/share/cacti/site/resource/script_server/host_disk.xml'

(LocalHost)
Data Query Debug Information
+ Running data query [6].
+ Found type = '4 '[script query].
+ Found data query XML file at '/usr/share/cacti/site/resource/script_queries/unix_disk.xml'
+ XML file parsed ok.
+ Executing script for list of indexes 'perl /usr/share/cacti/site/scripts/query_unix_partitions.pl index'
+ Executing script query 'perl /usr/share/cacti/site/scripts/query_unix_partitions.pl query device'
+ Found item [dskDevice='/dev/hda1'] index: /dev/hda1
+ Executing script query 'perl /usr/share/cacti/site/scripts/query_unix_partitions.pl query mount'
+ Found item [dskMount='/'] index: /dev/hda1
+ Found data query XML file at '/usr/share/cacti/site/resource/script_queries/unix_disk.xml'
+ Found data query XML file at '/usr/share/cacti/site/resource/script_queries/unix_disk.xml'
+ Found data query XML file at '/usr/share/cacti/site/resource/script_queries/unix_disk.xml'