Miguel, Jason, thanks for the prompt responses. I tried just the boosting -> score without the scoring dataset, still the same error. And the diagram is really easy: training data, partitioning, models, model compare and then score. I have yet to try the EMFlowscore. As for the problem note 15720, I checked View->Project Log for strings like "error", "not valid" and such, no luck. Jason, you were asking for the Project Log or some other log? By the way, as the simpler models run with no problem whatsoever, could it be something related to memory allocation or model "size"?
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