I realize this parameter is not required and can be auto detected. It works if no setting is provided.

2015.01.13 18:16:04.336 EST: [FATAL ERROR]
[1]: Unable to instantiate Site Catalog at edu.isi.pegasus.planner.catalog.site.SiteFactory.loadInstance(SiteFactory.java:227)
[2]: Unable to dynamically load edu.isi.pegasus.planner.catalog.site.impl.XML4 at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
2015.01.13 18:16:04.653 EST: [WARNING] Non-zero exit-code 2