r - boosted regression trees train error in caret package -


i trying use code below train boosted regression tree cv of auc. getting message:

error in { : task 1 failed - "subscript out of bounds"

if didn't specify distribution="gaussian", not receive error message.

any ideal fix problem? thank much.

 gbmgrid <- expand.grid(interaction.depth=(3:6), n.trees=(1:40)*100, shrinkage=.01)  gbmgrid$n.minobsinnode = rep(10,nrow(gbmgrid))  head(gbmgrid)   bootcontrol <- traincontrol(method='cv',classprobs = true,number=3,summaryfunction = twoclasssummary)   gmbfit<- caret::train(x,y,                   distribution="gaussian",                   method = "gbm",                    verbose = f,                    trcontrol = bootcontrol,                    bag.fraction=0.5,                   metric="roc",                   tunegrid=gbmgrid)


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