java and prolog problem

hi
i have installed well...interprolg+java_SWI Prolog
but when i execute an program which is in example direcotry it gives me
error

import junit.framework.*;
^
PrologEngineTest.java:11: package com.declarativa.interprolog.util does
not exist
import java.com.declarativa.interprolog.util.*;
^


what to do ???