Executing external job results in an ClassCastException (ExternalRun cannot be cast to AbstractBuild)

I'm trying to monitor with jenkins 1.475 an external executed job.
I copied the following files to client

• ant-1.8.3.jar
• commons-io-1.4.jar
• commons-lang-2.4.jar
• jenkins-core-1.475.jar
• jna-posix-1.0.3.jar
• remoting-2.16.jar
• xstream-1.3.1-jenkins-11.jar
  (as described in [1] and [2])
  The environmentvariable JENKINS_HOME is set properly.

When I execute the job with the command
> java jar jenkins-core*.jar "nameOfTheJob" cmd /c echo "Hello world!"

I got the result
> [...]
> Exception: java.lang.ClassCastException: hudson.model.ExternalRun cannot be cast to hudson.model.AbstractBuild
> [...]
> at
> org.jenkinsci.plugins.envinject.EnvInjectListener.onCompleted(EnvInjectListener.java:351)

The complete errorlog is attached.

[1] https://wiki.jenkins-ci.org/display/JENKINS/Monitoring+external+jobs
[2] http://kvdev.wordpress.com/2012/03/01/jenkins-monitoring-external-jobs/

Daniel