[xwiki-devs] saving XWiki.XWikiPreferences object exception

Hi, I'm trying to increase the maximum attachment size like it says here : http://www.xwiki.org/xwiki/bin/view/FAQ/Howtoincreasethemaximumattachmentsi… import a larger xar 40MB) but, when I save the XWiki.XWikiPreferences object I get : java.lang.StringIndexOutOfBoundsException: String index out of range: -1 java.lang.String.substring(String.java:1762) java.lang.String.substring(String.java:1735) com.xpn.xwiki.web.ActionFilter.getTargetURL(ActionFilter.java:167) com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:105) com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68) com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:295) com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112) Why is that? Tomcat version: apache-tomcat-6.0.18 XE version: xwiki-enterprise-web-2.0.2 Thanks, Anamaria