Autoupgrade from 1.4.7.0 to 1.4.8.2 PHP error

[Dreamtheme]

One of the websites i'm trying to upgrade from 1.4.7.0 to 1.4.8.2 after installing the new auto-upgrade module is giving error "[server Error] Status message : error" after it should be completed at the very end where it says "0 files left to upgrade"

 

I checked out the php error log and it says the following:

 

PHP Notice: Use of undefined constant _PS_CACHEFS_DIRECTORY_ - assumed '_PS_CACHEFS_DIRECTORY_' in /home/public_html/modules/autoupgrade/AdminSelfUpgrade.php on line 1435

PHP Warning: scandir(_PS_CACHEFS_DIRECTORY_/) [<a href='function.scandir'>function.scandir</a>]: failed to open dir: No such file or directory in /home/public_html/modules/autoupgrade/Tools14.php on line 531

PHP Warning: scandir() [<a href='function.scandir'>function.scandir</a>]: (errno 2): No such file or directory in /home/public_html/modules/autoupgrade/Tools14.php on line 531

PHP Warning: Invalid argument supplied for foreach() in /home/public_html/modules/autoupgrade/Tools14.php on line 532

PHP Fatal error: Class 'CacheFs' not found in /home/public_html/modules/autoupgrade/AdminSelfUpgrade.php on line 1436

 

any idea?

Edited May 21, 2012 by Dreamtheme (see edit history)