I noticed in your CVS repository that you appear to be using some APIs
from the ECF project. ECF recently released version 0.9.3  which has
caused (major) backwards compatibility breaking changes. I don't know
whether the Higgins project is still leveraging ECF or not since it
seems the last commits to org.eclipse.ecf.higgins and
org.eclipse.ecf.provider.rss were about three months ago, so if you
aren't, I apologize for making this uninformed post.
If, however, the Higgins project still is making use of ECF's APIs, and
has trouble migrating because of the changes that's been brought in with
0.9.3 or any questions or comments at all, please don't hesitate to
contact us via the ECF newsgroup or ecf-dev mailing list. Thanks.