The release job has always some problem related to the command executed.
I think we should apply the following changes:

1) Only call versioned script file from jenkins:
we should not have code written in the job configuration, instead we should have some files that we can call from jenkins or from the computer we run the release.

2) We should use the maven release plugin instead of the version plugin:
maven version plugin seems to have problem with the structure of our project. Using the release plugin worked very well in the latest releases.

3) We should move the creation of the website releated file to a a separate job.