DiceStatistics - Represent Pair Of Dice And Totals Of Their Rolls

Create a class called DiceStatistics to represent a pair of dice and the totals of their rolls. It should have an array of two Dice as a private data member (these are the Dice from Problem 1). It should also have, as a data member, an array of integers to represent the possible totals of rolling two dice.

The class should also have the following methods:

initStats() to initialize all the totals to zero.
rollOnce() to roll each die once, and add one to the correct totals element
printStatistics() to print the number of times each total has come up over the number of runs.

Here is my code:

public class DiceStatistics {
private final int NUMBER_OF_DICE = 2;
private Dice[] dice = new Dice[NUMBER_OF_DICE];
private int[] totals;
private int numberOfRolls;

[Code] ....

And here is the error:

run:
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: Dice.roll
at DiceStatistics.rollOnce(DiceStatistics.java:27)
at DiceStatistics.main(DiceStatistics.java:55)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

I know it has something to do with the fact that I need to somehow import the information from my first program "Dice" into this in order to actually get the dice statistics, but how do I do that?