Index: trunk/deployment/resources/xsl/default/default/errors.xsl
===================================================================
--- trunk/deployment/resources/xsl/default/default/errors.xsl (revision 1685)
+++ trunk/deployment/resources/xsl/default/default/errors.xsl (revision 1720)
@@ -50,4 +50,7 @@
         Error: choose group is suppressed.  You cannot perform that action at this time.
       </xsl:when>
+      <xsl:when test="id='org.bedework.client.error.duplicatecategory'">
+        Cannot add: the category already exists.
+      </xsl:when>
       <xsl:when test="id='org.bedework.client.error.duplicatecontact'">
         Cannot add: the contact already exists.