Error while configuring postgresql

Hi,

I am configuring postgresql db instead camunda engine h2.
But I am facing following error:

I am using "jboss-as-7.2.0.Final’ and jdk1.7.0.

I have modified my standalone.xml and module.xml as follows,

The same folder structure I have created as shown in at this site : https://developer.jboss.org/blogs/amartin-blog/2012/02/08/how-to-set-up-a-postgresql-jdbc-driver-on-jboss-7
I am failing @step 5.

I don’t know what I am missing.

Thank you,
Jignesh Pithva.