You don't have datasource file in your deployment. You can get the file from sourceforge from one of the bundled distribution. It's portal-hsqldb-ds.xml.
Or create a xml file with the same name and following content:
<?xml version="1.0" encoding="UTF-8"?>
and copy this file in deploy directory. It should be fine after that.
hsqldb-ds.xml defines DefaultDS that is needed for other components of JBoss to work. portal-hsql-ds defines PortalDS for portal to work.
You can name your datasource file anything you want but it should have -ds.xml in it's name and datasource named PortalDS.