We're making a sort of yahtzee-type dice game.
There are two classes, Die, and Dice. Dice serves as a collection and means of manipulating multiple Die at a time.

The class for the dice is relatively simple and unimportant at the moment storing a 'size' value, a 'value' value, along with set, get, and roll methods.

In the 'Dice' Class, I add desired Die into an ArrayList, as I was told to.
Adding Die to this list is not difficult.

However, I am also to be able to add Die from a and existing 'Dice' object.

Here's what I've got so far.



This part seems to work fine. (I've already declared the ArrayList a while back.)
Now here is where I get problems.



Why this does not work is beyond me. Please help. Much appreciated.
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