Running examples in 'pROC-Ex.R' failed
The error most likely occurred in:

> ### Name: ggroc.roc
> ### Title: Plot a ROC curve with ggplot2
> ### Aliases: ggroc.roc ggroc.list ggroc
> 
> ### ** Examples
> 
> # Create a basic roc object
> data(aSAH)
> rocobj <- roc(aSAH$outcome, aSAH$s100b)
> rocobj2 <- roc(aSAH$outcome, aSAH$wfns)
> 
> library(ggplot2)
> g <- ggroc(rocobj)
> g
> # with additional aesthetics:
> ggroc(rocobj, alpha = 0.5, colour = "red", linetype = 2, size = 2)
> 
> # You can then your own theme, etc.
> g + theme_minimal() + ggtitle("My ROC curve")
> 
> # Multiple curves:
> g2 <- ggroc(list(s100b=rocobj, wfns=rocobj2, ndka=roc(aSAH$outcome, aSAH$ndka)))
> g2
> 
> # This is equivalent to using roc.formula:
> roc.list <- roc(outcome ~ s100b + ndka + wfns, data = aSAH)
> g.list <- ggroc(roc.list)
> g.list
> 
> # with additional aesthetics:
> g3 <- ggroc(roc.list, linetype=2)
> g3
> g4 <- ggroc(roc.list, aes="linetype", color="red")
> g4
> 
> # OR faceting
> g.list + facet_grid(.~name) + theme(legend.position="none")
Error in namespaceExport(ns, exports) : 
  undefined exports: %s!=%, %s!==%, %s+%, %s<%, %s<=%, %s==%, %s===%, %s>%, %s>=%, %stri!=%, %stri!==%, %stri+%, %stri<%, %stri<=%, %stri==%, %stri===%, %stri>%, %stri>=%, stri_datetime_add<-, stri_sub<-, stri_subset<-, stri_subset_charclass<-, stri_subset_coll<-, stri_subset_fixed<-, stri_subset_regex<-, stri_c, stri_c_list, stri_cmp, stri_cmp_eq, stri_cmp_equiv, stri_cmp_ge, stri_cmp_gt, stri_cmp_le, stri_cmp_lt, stri_cmp_neq, stri_cmp_nequiv, stri_compare, stri_conv, stri_count, stri_count_boundaries, stri_count_charclass, stri_count_coll, stri_count_fixed, stri_count_regex, stri_count_words, stri_datetime_add, stri_datetime_create, stri_datetime_fields, stri_datetime_format, stri_datetime_fstr, stri_datetime_now, stri_datetime_parse, stri_datetime_symbols, stri_detect, stri_detect_charclass, stri_detect_coll, stri_detect_fixed, stri_detect_regex, stri_dup, stri_duplicated, stri_duplicated_any, stri_enc_detect, stri_enc_detect2, stri_enc_fromutf32, stri_enc_get, stri_enc_inf
Calls: <Anonymous> ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted