Error in Subs.php in SMF on Post preview : Undefined index: forum

[Savera]

Hi
In one of smf installation, I am seeing following error

Code: [Select]

http://linktomysmfforum/index.php?action=post2;board=10;preview;xml

8: Undefined index: forum

 File: /home/saverasite/Sources/Subs.php
 Line: 3902
I saw code it says;

Code: [Select]

'forum' => array(
'title' => $txt['forum'],
'href' => $scripturl,
'show' => true,
'sub_buttons' => array(
),I don't find anything wrong it , pleas help me where is the problem ?

I am running SMF 2.0.2 on apache 2 and php 5.2