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

> ### Name: smpic_save
> ### Title: Save a social media sized ggplot
> ### Aliases: smpic_save
> 
> ### ** Examples
> 
> library(dplyr)

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

> library(ggplot2)
> library(smpic)
> 
> p <- ggplot(iris) +
+      geom_point(aes(Petal.Length, Petal.Width, color = Species), show.legend = FALSE) +
+        geom_label(data = summarise_if(group_by(iris, Species), is.numeric, mean),
+                   aes(Petal.Length, Petal.Width, label = Species, color = Species),
+                   show.legend = FALSE) +
+        labs(x = "Petal Length", y = "Petal Width",
+             title = "Look mom, a flower plot!",
+             subtitle = "Yet another iris data set visualization.",
+             caption = "Source: iris") +
+        theme_minimal()
> 
>   smpic_view(p, sm = "facebook_shared_images", text_factor = 2.2)
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: smpic_view ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted