Index: openacs-4/packages/xowiki/tcl/xowiki-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-procs.tcl,v
diff -u -r1.414 -r1.415
--- openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	2 Jul 2010 10:03:22 -0000	1.414
+++ openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	5 Jul 2010 09:30:56 -0000	1.415
@@ -1182,6 +1182,8 @@
   } {
     set page [my instantiate_includelet $arg]
     if {$page eq ""} {
+      # The variable 'page_name' is required by the message key
+      set page_name $arg
       return [my error_during_render [_ xowiki.error-includelet-unknown]]
     }
     if {[$page istype ::xowiki::Page]} {