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

> ### Name: shrinkage
> ### Title: Predict shrinkage of empirical Bayes estimates (EBEs) in a
> ###   population model
> ### Aliases: shrinkage
> 
> ### ** Examples
> 
> library(PopED)
> 
> ############# START #################
> ## Create PopED database
> ## (warfarin example)
> #####################################
> 
> ## Warfarin example from software comparison in:
> ## Nyberg et al., "Methods and software tools for design evaluation 
> ##   for population pharmacokinetics-pharmacodynamics studies", 
> ##   Br. J. Clin. Pharm., 2014. 
> 
> ## find the parameters that are needed to define from the structural model
> ff.PK.1.comp.oral.sd.CL
function (model_switch, xt, parameters, poped.db) 
{
    with(as.list(parameters), {
        y = xt
        y = (DOSE * Favail * KA/(V * (KA - CL/V))) * (exp(-CL/V * 
            xt) - exp(-KA * xt))
        return(list(y = y, poped.db = poped.db))
    })
}
<bytecode: 0x00000000099a0d20>
<environment: namespace:PopED>
> 
> ## -- parameter definition function 
> ## -- names match parameters in function ff
> sfg <- function(x,a,bpop,b,bocc){
+   parameters=c(CL=bpop[1]*exp(b[1]),
+                V=bpop[2]*exp(b[2]),
+                KA=bpop[3]*exp(b[3]),
+                Favail=bpop[4],
+                DOSE=a[1])
+   return(parameters) 
+ }
> 
> ## -- Define initial design  and design space
> poped.db <- create.poped.database(ff_fun=ff.PK.1.comp.oral.sd.CL,
+                                   fg_fun=sfg,
+                                   fError_fun=feps.prop,
+                                   bpop=c(CL=0.15, V=8, KA=1.0, Favail=1), 
+                                   notfixed_bpop=c(1,1,1,0),
+                                   d=c(CL=0.07, V=0.02, KA=0.6), 
+                                   sigma=0.01,
+                                   groupsize=32,
+                                   xt=c( 0.5,1,2,6,24,36,72,120),
+                                   minxt=0,
+                                   maxxt=120,
+                                   a=70)
> 
> ############# END ###################
> ## Create PopED database
> ## (warfarin example)
> #####################################
> 
> shrinkage(poped.db)
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: shrinkage ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted