Index: lams_tool_chat/web/WEB-INF/tiles-defs.xml
===================================================================
diff -u -ref851974c4dc3f5468b188fab9997a37b73c0e50 -rdbad8619d09c6a235f29d963d58b4c2310f82013
--- lams_tool_chat/web/WEB-INF/tiles-defs.xml	(.../tiles-defs.xml)	(revision ef851974c4dc3f5468b188fab9997a37b73c0e50)
+++ lams_tool_chat/web/WEB-INF/tiles-defs.xml	(.../tiles-defs.xml)	(revision dbad8619d09c6a235f29d963d58b4c2310f82013)
@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="ISO-8859-1"?>
+
+<!DOCTYPE tiles-definitions PUBLIC
+        "-//Apache Software Foundation//DTD Tiles Configuration 1.3//EN"
+        "http://struts.apache.org/dtds/tiles-config_1_4.dtd">
 <!--
 	Copyright (C) 2005 LAMS Foundation (http://lamsfoundation.org)
 	License Information: http://lamsfoundation.org/licensing/lams/2.0/