#26 Webacula Error from browser

[Saad]

I am trying to configure the webacula for my bacula version 5.2
the webacula version i have is 5.5
Below is message i get when I try to browse webacula

Fatal error: Uncaught exception 'Zend_Exception' with message 'Directory "/usr/share/webacula/data/cache" is not exists or not writable.' in /usr/share/webacula/html/index.php:194
Stack trace:

0 {main}

thrown in /usr/share/webacula/html/index.php on line 194

If I browse from my OS I can see the directory

[root@pi-nfs-server1 webacula]# ls -l /usr/share/webacula/data/cache
total 0
-rw-rw-r-- 1 www-data www-data 0 May 11 2011 _dummy
[root@pi-nfs-server1 webacula]# ls -l /usr/share/webacula/data/
total 8
drwxrwxr-x 2 www-data www-data 4096 May 11 2011 cache
-rw-rw-r-- 1 www-data www-data 50 May 11 2011 README

Does any one have idea on why its complaining on non-existent directory ? Maybe the permissions are the cause that webacula is not able to write to this directory ?

Thanks in advance