Hello, Whenever I try to add an extension from XWIKI 3.4 (on RedHat 6, tomcat6 with PostgreSQL database) from the ‘Add Extensions’ menu, I get a message like this Caused by: class java.io.IOException: File 'data/extension/repository/org.xwiki.contrib%3Axwiki-plugin-excel-1.0-src.pl ugin' could not be created ð It looks like a directory is missing in my WIKI install, could you tell me the exact path of the data/extension/repository (from the XWIKI app root) ? Also, the problem I encountered earlier with Lucene came from the xwiki.cfg #-# Lucene search engine #-# Location where to place the lucene index files. The default is the "lucene" subdirectory in the container's "work" #-# diectory. Change it if you want to store indexes in another place. # xwiki.plugins.lucene.indexdir=/usr/local/xwiki/lucene Well it looks like XWIKI really choose /usr/local/wiki/lucene and nothing into a ‘work’ container as the documentation seems to indicate. Could you fix the default xwiki.cfg file (Description or content) on Red Hat, it looks like we should have: # xwiki.plugins.lucene.indexdir=/usr/local/xwiki/lucene xwiki.plugins.lucene.indexdir=/usr/share/tomcat6/work Many thanks for your help, Regards, Christophe FRAULE