java.lang.NullPointerException: The scm url cannot be null.
I've never seen that message. I don't know what causes it... A quick
web-search found this message with maven - 1 - but I presume you're
using the latest Maven or something close to that, right?
What source did you use (e.g., 2.2.2 source distribution, the current
SVN / trunk or tag?)?