Jetty’s jar included in the whack is the wrong one.
You will need to download two other jars on http://search.maven.org/
Enter jetty-server in the search field and click on all(*) from latest version column of the org.eclipse.jetty.aggregate line then click on the 5th page, you should find the 7.0.1.v20091125 version.
Do the same for jetty-webapp and you should be good to go.