IMP and PHPLib

[alexus]

sorry I already post this question earlier and i didn't get a response so
i'm posting it again..

when i go to http://box.nexgen.com/horde/imp/

i get

Fatal error: Cannot instantiate non-existent class: hordesession in
/usr/local/apache/phplib-7.2c/php/page.inc on line 18

I can send page.inc file if anyone wants to take a look... basically I took
it off of http://www.horde.org/phplib/ site .. I dont know what could've
possible cause what's happening now..

thanks in advance