<dplyr:::mutate_error/rlang_error/error/condition>
Error in `dplyr::mutate(., performance = purrr::map2_dbl(.x = model_fit, 
    .y = newY, .f = function(.x, .y) {
        pred_rocr = ROCR::prediction(.x$SL.predict, .y)
        measure = ROCR::performance(pred_rocr, measure = perf_measure, 
            x.measure = "cutoff")@y.values[[1]]
        return(measure)
    }))`: i In argument: `performance = purrr::map2_dbl(...)`.
Caused by error in `purrr::map2_dbl()`:
i In index: 112.
Caused by error in `ROCR::prediction()`:
! Number of classes is not equal to 2.
ROCR currently supports only evaluation of binary classification tasks.