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

> ### Name: PPclassNodeViz
> ### Title: PPtree node visualization
> ### Aliases: PPclassNodeViz
> ### Keywords: tree
> 
> ### ** Examples
> 
> data(iris)
> Tree.result <- PPTreeclass(Species~., data = iris,"LDA")
> Tree.result
============================================================= 
Projection Pursuit Classification Tree result 
=============================================================

1) root
   2)* proj1*X < cut1  ->  "setosa"
   3)  proj1*X >= cut1
      4)* proj2*X < cut2  ->  "versicolor"
      5)* proj2*X >= cut2  ->  "virginica"

Error rates of various cutoff values 
-------------------------------------------------------------
           Rule1 Rule2  Rule3  Rule4 Rule5 Rule6  Rule7  Rule8
error.rate  0.02  0.02 0.0267 0.0267  0.02  0.02 0.0267 0.0267
> PPclassNodeViz(Tree.result,1,1)
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: PPclassNodeViz ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted