The pluggin stopped to work with the new versions of the Twitter API, so I upgraded the dependencies with the Twitter4j library so the pluggin works again.
Also I upgraded the Grails version to the latest 2.3.0. Don't know if this was necessary but there is anyway.
Changing Twitter4j version to 3.0.3
Changed grails version to 2.2.3
New version packaged
Ready for 2.3.0