[xwiki-users] XWiki Publication Workflow Application

Hi, Basically my need is to have a simple workflow, someone to edit a page and another to validate and publish. I can't get this extension working, i setup it on XWIKI 4.4 (5.2 too) and try to run a workflow but i always get "workflow.script.failed". Please, do you know how to get it work ? Thanks in advance