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

> ### Name: AgPalik
> ### Title: AgPalik
> ### Aliases: AgPalik
> ### Keywords: datasets
> 
> ### ** Examples
> 
> data(AgPalik)
> str(AgPalik$raw())
'data.frame':	241 obs. of  4 variables:
 $ wavelength: num  0.155 0.207 0.248 0.275 0.31 ...
 $ epsilon   : cplx  1+0i 1+0i 1+0i ...
 $ real      : num  1 1 1 1 1.01 ...
 $ imag      : num  5.84e-06 1.68e-05 3.04e-05 4.42e-05 7.16e-05 ...
> AgPalik$comment
$source
[1] "Silver in the visible, Palik"

$units
[1] "nanometres"

> demo(AgPalik)


	demo(AgPalik)
	---- ~~~~~~~

> library(dielectric)

> library(ggplot2)

> data(AgPalik)

> AgPalik$set_span(200, 800)

> raw <- dielectric2plot(AgPalik$raw())

> silver <- AgPalik$predict(n=300, all.knots=TRUE, df=200)

> d <- dielectric2plot(silver)

> ggplot(d, aes(wavelength, value)) + geom_path() +
+   facet_grid(variable~., scales="free") +
+   geom_point(data=raw)
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: demo ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted