Not generating statistics

Hi,

I am getting problem with statistics, which are not generating. It is showing same message "There are currently no statistics available", but we have the data.

i am running maintenance script via cron using lynx
lynx > /dev/null -dump http://www.mysite.com/adservers/maintenance/maintenance.php
but it is not generating stats,

also when i clear the cache in /var/www/html/adservers/var/cache and run the script still it is not generating

when i see the debug.log i see lot of warnings.. see some of them below..

Oct 15 11:43:26 OA [warning] Invalid argument supplied for foreach()
Oct 15 11:43:26 OA [warning] Invalid argument supplied for foreach()
Oct 15 11:43:26 OA [warning] array_keys() [function.array-keys]: The first argument should be an array
Oct 15 11:43:26 OA [warning] Invalid argument supplied for foreach()
Oct 15 11:43:26 OA [warning] Invalid argument supplied for foreach()
Oct 15 11:43:26 OA [warning] Invalid argument supplied for foreach()

ad serving and ad delivery is working fine.

please let me know what is the problem.

Thanks,
Suresh.