Hi,
Your problem is easy to fix (I think I provided a fix that should work in most cases in the trunk). See http://jira.xwiki.org/jira/browse/XWIKI-530 for details, and
http://www.xwiki.org/xwiki/bin/view/FAQ/WhyAmIGettingANullPointerExceptionWhenUploadingFiles for a fix for your problem.
Hello!
As Dan i've just installed xwiki beta 4. I fail when trying to import the xwiki-1.0-beta-4.xar : it loads the page http://<server>/xwiki/bin/upload/XWiki/Import with "tempdirnotset" written on it. However when coming back to the import page the name of the file appears with a size = 0.
I tried then to import only the xwiki-application-panels.xar, and managed to do it successfully. Is it a problem of size and can i fix it?
I can now access the PanelWizard and modify the layout and add panels. But even when saving it doesn't keep my preferences and it comes back to the simple start layout without panels. I don't know if it's tied but when i load the PanelWizard page it forces the english display, i then add the panels (they show up), and when i go back to Webhome they disappear, and i go back to french version :/
Thanks
Nicolas