[xwiki-users] SpaceExplorer (treeview) in xWiki Enterprise 2.4

Hello, I upgrade my xWiki to 2.4 and I have a problem with SpaceExplorer. It doesn't work. When I try to use it, xWiki returns an error: XWIKIEXPLORER.JS DEPENDS ON XWIKI.JS In the older version of xWiki everything works fine (2.2). I was going through the js scripts and the structure is the same as it was in xWiki 2.2. Does anybody know where is the problem? Thanks, Zuzana.