Error - 'argument of length 0'

Hi

I am using Predictive Analysis 1.0.10. I can run the clustering algorithm (R-K-Means) successfully so I assume that I am set up and configured correctly, but I get an error when I run the Decision Trees algorithm (R-CNR Tree):

     "Error in 1:nrow(object$splits) : argument of length 0

I have tried various permutations of fields and settings.

Any idea what the problem might be?

Thanks

Al.