Hi everyone.. Im getting this error while attempting the silent upgrade.. any suggestions??

"system Sugarcrm 4.5.1 Debian linux php5 Mysql"

I did all the memory and buffer change mods in the php.ini and I cant get to pass this point.

if I use the -f flag it doesnt display anything all it does is go back to prompt


crm:/opt/sugarcrm# php -a silentUpgrade.php /opt/sugarcrm/SugarCE-Upgrade-4.5.1
-to-5.1.0.zip /opt/sugarcrm/log.log /opt/sugarcrm/htdocs/sugarcrm
Interactive mode enabled


************************************************** ******************
***************This Upgrade process may take sometime***************
************************************************** ******************


Fatal error: Class 'SugarBean' not found in /opt/sugarcrm/htdocs/sugarcrm/data/T
racker.php on line 205
crm:/opt/sugarcrm#
Thanks

Ludvin