[R] Error: all the ROC metric values are missing:

[Neha gupta]

What is the problem is the code..

d=readARFF("CM1.arff")

index <- createDataPartition(d$Defective, p = .70,list = FALSE)
tr <- d[index, ]
ts <- d[-index, ]
index_2 <- createFolds(tr$Defective, returnTrain = TRUE, list = TRUE)

ctrl <- trainControl(method = "boot", number=100, index = index_2,
search="random", classProbs = TRUE,
 summaryFunction=twoClassSummary,savePredictions = T)


net <- train(Defective ~ ., data = tr,
           method = "nnet",
           metric = "ROC",
           preProc = c("center", "scale", "nzv" ),
           trControl = ctrl, na.action=na.exclude)
getTrainPerf(net)


I am getting the error as below:

Something is wrong; all the ROC metric values are missing:
      ROC           Sens          Spec
 Min.   : NA   Min.   : NA   Min.   : NA
 1st Qu.: NA   1st Qu.: NA   1st Qu.: NA
 Median : NA   Median : NA   Median : NA
 Mean   :NaN   Mean   :NaN   Mean   :NaN
 3rd Qu.: NA   3rd Qu.: NA   3rd Qu.: NA
 Max.   : NA   Max.   : NA   Max.   : NA
 NA's   :3     NA's   :3     NA's   :3

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