Issue in creating a SiteMap application

Hi Experts,

    I am working on creating a Sitemap application for our portal users.I am following the below link

http://help.sap.com/saphelp_nw73ehp1/helpdata/en/49/e45186272f7517e10000000a42189b/content.htm

i have added the com.sap.portal.navigation.api_service_api.jar file to java build path. i am not facing any issue in import or in java file.but when i try to build the dc i am getting the build error.

     [javac] ERROR: <path>: package com.sapportals.portal.navigation does not exist

     [javac] ERROR: import com.sapportals.portal.navigation.INavigationNode;

     [javac] ERROR:                                        ^

     [javac] ERROR: <path>: package com.sapportals.portal.navigation does not exist

     [javac] ERROR: import com.sapportals.portal.navigation.INavigationService;

     [javac] ERROR:                                        ^

     [javac] ERROR: <Path>: package com.sapportals.portal.navigation does not exist

     [javac] ERROR: import com.sapportals.portal.navigation.NavigationNodes;

     [javac] ERROR:                                        ^

Am i missing something here?

Regards,

Naga