ERROR:Decision Trees found no splits for model

Hi,

I am running into "Decision Trees found no splits for model" error when I am processing one of the cubes from "Delivering BI using SQL Server 2005" book. The minining structure has four columns , the fourth one being marked as predict only. I have created a cube slice to include only 40% of the data & I did check it to make sure the cube has data. I am lost as this is a very simple mining model (MaxMinSalesDM cube, Classification - Childeren at Home structure, in case any of you have used the code from the book before)

Thanks for your help!
-Josh
.