zk on pluto portal

Hello
I am a new pluto users.
I try to insert into pluto portal a zk application.
I used for the first time the zkdemo web application.
I am not able to see the zk portlet inside the portal server.

This is my portlet.xml file:
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<portlet-app version="1.0"
 xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd 
http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd">
    <portlet>
        <description>ZK loader for ZUML pages</description>
        <portlet-name>zkdemoportletA</portlet-name>
        <display-name>ZK Portlet Loader</display-name>

       
<portlet-class>org.zkoss.zk.ui.http.DHtmlLayoutPortlet</portlet-class>

        <expiration-cache>0</expiration-cache>

        <supports>
            <mime-type>text/html</mime-type>
            <portlet-mode>VIEW</portlet-mode>
        </supports>

        <supported-locale>en</supported-locale>

        <portlet-info>
            <title>ZK</title>
            <short-title>ZK</short-title>
            <keywords>ZK,ZUML</keywords>
        </portlet-info>

        <!-- An example to specify zk_page -->
       
        <init-param>
            <param-name>zk_page</param-name>
            <param-value>index.zul</param-value>
        </init-param>
        <init-param>
            <param-name>config</param-name>
            <param-value>index.zul</param-value>
        </init-param>
        <init-param>
      <name>config</name>
      <value>/WEB-INF/testsuite-config.xml</value>
    </init-param>

        <portlet-preferences>
            <preference>
                <name>zk_page</name>
                <value>index.zul</value>
            </preference>
        </portlet-preferences>

        <security-role-ref>
      <role-name>tomcat</role-name>
      <role-link>tomcat</role-link>
    </security-role-ref>
       
    </portlet>
</portlet-app>
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This is the web.xml file
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<servlet-mapping>
        <servlet-name>zkdemoportletA</servlet-name>
        <!-- <url-pattern>/zkdemo/userguide/index.zul</url-pattern> -->
        <url-pattern>/zkdemoportletA/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>zkdemoportletA</servlet-name>
        <!-- <url-pattern>/zkdemo/userguide/index.zul</url-pattern> -->
        <url-pattern>/userguide/*</url-pattern>
    </servlet-mapping>
<servlet-mapping>
        <servlet-name>zkdemoportletA</servlet-name>
        <!-- <url-pattern>/zkdemo/userguide/index.zul</url-pattern> -->
        <url-pattern>/zkdemo/*</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>zkLoader</servlet-name>
        <!-- <url-pattern>/zkdemo/userguide/index.zul</url-pattern> -->
        <url-pattern>/zkLoader/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>zkLoader</servlet-name>
        <!-- <url-pattern>/zkdemo/userguide/index.zul</url-pattern> -->
        <url-pattern>/userguide/*</url-pattern>
    </servlet-mapping>  

______________

This is the error:
The requested resource (/zkdemo/PlutoInvoker/zkdemoportletA) is not
available

Could some of you help me?

Thanks
Matteo