Why I am getting "Default page does not exist" error in JBoss EPP 4.3?

Issue

Hello. I recently changed my default-object.xml file, and I get the following error message when a user goes to the typical URL that used to present the login page:

"javax.servlet.ServletException: java.lang.IllegalStateException: Default page does not exist
 org.jboss.portal.server.servlet.PortalServlet.service(PortalServlet.java:278)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)"

The following are some excerpts in the $EPP_HOME/server/$PROFILE/deploy/jboss-portal(-ha).sar/conf/data/default-object.xml that I think may be affecting things:

<deployments>
   <deployment>
      <context>
         <context-name/>
         <properties>
         ...
         <!--
            | The default portal name, if the property is not explicited then the default portal name is "default"
            -->
          <property>
            <name>portal.defaultObjectName</name>
            <value>default</value>
          </property>
          ...
         </properties>
      </context>
   </deployment>
   <deployment>
      <parent-ref/>
      <if-exists>keep</if-exists>
      <portal>
         <portal-name>default</portal-name>
         ...
         <property>
           <name>portal.defaultObjectName</name>
           <value>MyDefaultPage</value>
         </property>
         ...
         <page>
            <page-name>MyDefaultPage</page-name>
            ...
         </page>
         ...
      </portal>
   </deployment>
   <deployment>
      <if-exists>keep</if-exists>
      <context>
         <context-name>dashboard</context-name>
         ...
      </context>
   </deployment>
   ...
</deployments>