[imp] getting error whiel using mimp

[Deepa Kalra]

We are using plesk 8.2 and default horde install

 tried to configue mimp as per guides also updated imp (updated servers.php only as per requirements for plesk)

however now when  we are trying to login at webmail.domain.com/horde/mimp

It redirects to /imp and upon entering username and password it produces following error:



Fatal error: Call to undefined static function: horde_array::array_merge_recursive_overwrite() in E:\vhosts\webmail\horde\mimp\lib\base.php on line 91


could any oen help

what to checkk

its a plesk for windows server .