Another Metrics

[PARODBE]

Hi,

I need help, please, for include another metric, how could I introduce in the code??? I would like calculate the importance with the auc.
Normally, I programming in python sorry. I understand something like Metric::auc??? But I obtain the error: "Error in if (self$original.error == 0 & self$compare == "ratio") { :
missing value where TRUE/FALSE needed"

Thanks!
Pablo