https://github.com/jenkinsci/jenkins/pull/3122 changed the AbstractTaskListener in a non serialization friendly way.

For Jenkins this is not normally a problem as the same versions of classes will be used on both ends of a remoting endpoint, but custom derivatives may not have this luxury, or may use a different form of serialization other than XStream.

The simple fix that appears to work is to restore the serialVersionUID to the pre change version.