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Unable to install keystone , sqlalchemy operational error

I am trying to configure Openstack on my system Ubuntu 12.04 LTS, while installing keystone I am getting an error related to SQLAlchemy as follows:

Preconfiguring packages ... Selecting previously unselected package keystone. (Reading database ... 215275 files and directories currently installed.) Unpacking keystone (from .../keystone_2012.2.3+stable-20130206-82c87e56-0ubuntu2~cloud0_all.deb) ... Processing triggers for man-db ... Processing triggers for ureadahead ... Setting up keystone (2012.2.3+stable-20130206-82c87e56-0ubuntu2~cloud0) ...

sqlalchemy.exc.OperationalError: (OperationalError) unable to open database file None None dpkg: error processing keystone (--configure): subprocess installed post-installation script returned error exit status 1 E: Sub-process /usr/bin/dpkg returned an error code (1)

I searched and found out that the path to SQLite should be defined but I'm not sure how to do that. I have already installed Python-MySQLDB and MySQL-server. Kindly provide some pointers on how to resolve this issue.