Problems with cron
 

Hello,
I'm read all post in this forum about "cron", but I have still problems :confused:
I set a cron job by "Cpanel" in this way:
-----
/usr/local/bin/php -f /full_path_phpdig/admin/spider.php forceall > /full_path_phdig_spider/spider.log
-----

But this does not work (either with "all" it does not work).
In the spider, log I read:
-----
9307: old priority 0, new priority 18
Spidering in progress...
-----------------------------
SITE : http://www.mydomain.com/
Exclude paths :
- @NONE@
No link in temporary table
links found : 0
Optimizing tables...
Indexing complete !
-----
No one document was indexed.
Where I am wrong?
Thank you very much.
Maurizio Mascheroni