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

> ### Name: cat_plot
> ### Title: Plot interaction effects between categorical predictors.
> ### Aliases: cat_plot
> 
> ### ** Examples
> 
> 
> library(ggplot2)
> fit <- lm(price ~ cut * color, data = diamonds)
> cat_plot(fit, pred = color, modx = cut, interval = TRUE)
> 
> # 3-way interaction
> 
> ## Will first create a couple dichotomous factors to ensure full rank
> mpg2 <- mpg
> mpg2$auto <- "auto"
> mpg2$auto[mpg2$trans %in% c("manual(m5)", "manual(m6)")] <- "manual"
> mpg2$auto <- factor(mpg2$auto)
> mpg2$fwd <- "2wd"
> mpg2$fwd[mpg2$drv == "4"] <- "4wd"
> mpg2$fwd <- factor(mpg2$fwd)
> ## Drop the two cars with 5 cylinders (rest are 4, 6, or 8)
> mpg2 <- mpg2[mpg2$cyl != "5",]
> mpg2$cyl <- factor(mpg2$cyl)
> ## Fit the model
> fit3 <- lm(cty ~ cyl * fwd * auto, data = mpg2)
> 
> # The line geom looks good for an ordered factor predictor
> cat_plot(fit3, pred = cyl, modx = fwd, mod2 = auto, geom = "line",
+  interval = TRUE)
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