@sidd211095: maybe there is a problem with the bugtracker link you used, take a look here.

@known: quick solution:
as root, open in a text editor the file /var/lib/dpkg/info/harmattan-icons-pack-for-white-themes.postinst and comment out the second line.
You have to modify it from

p.xsbc_bugtracker="http://bugs.maemo.org"

to

#p.xsbc_bugtracker="http://bugs.maemo.org"

Then, open xterm and always as root run apt-get install -f