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

> ### Name: estTable
> ### Title: estTable
> ### Aliases: estTable
> 
> ### ** Examples
> 
> 
> ## run onephase estimation:
> op.a <- onephase(formula = tvol~1,
+                  data = grisons,
+                  phase_id = list(phase.col = "phase_id_2p", terrgrid.id = 2),
+                  area = list(sa.col = "smallarea", areas = c("A", "B", "C", "D")))
> 
> ## run small area twophase estimation:
> sae.2p.est <- twophase(formula = tvol ~ mean + stddev + max + q75,
+                        data = grisons,
+                        phase_id = list(phase.col = "phase_id_2p", terrgrid.id = 2),
+                        small_area = list(sa.col = "smallarea", areas = c("A", "B","C", "D"),
+                                          unbiased = TRUE))
> 
> ## run small area threephase estimation:
> sae.3p.est <- threephase(formula.s0 =  tvol ~ mean,
+                          formula.s1 = tvol ~ mean + stddev + max + q75,
+                          data = grisons,
+                          phase_id = list(phase.col = "phase_id_3p", s1.id = 1, terrgrid.id = 2),
+                          small_area=list(sa.col = "smallarea", areas = c("A", "B", "C", "D"),
+                                          unbiased = TRUE))
> 
> ## create estimation table with confidence intervals:
> sae.table<- estTable(est.list = list(op.a, sae.2p.est, sae.3p.est), add.ci=TRUE,
+                      sae = TRUE, vartypes = c("variance", "g_variance",  "ext_variance"))
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: estTable ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted