"ISystems" error

Hi,

I am trying to develop an application that will give the info regarding the systems.

For that I found that I need to get ISystem , ISystems classes.

I found that the path to the jar that contains this is : com.sap.portal.ivs.api_landscape/lib/com.sap.portal.ivs.api_landscapeapi.jar

But on viewing this jar I found that it contains the ISystemExtended and ISystemsExtended.I added the jar to my project build path .

I tried to use the same , but in NWDS I get this error : "this compilation unit indirectly references the missing type com.sap.portal.pcm.system.ISystems.

Please help me out in resolving this issue.

Thnx,

Pravesh Puria.