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

> ### Name: hybridModel
> ### Title: Hybrid model simulation.
> ### Aliases: hybridModel
> 
> ### ** Examples
> 
> # Migration model
> # Parameters and initial conditions for an SIS model
> # loading the data set 
> data(networkSample) # help("networkSample"), for more info
> networkSample <- networkSample[which(networkSample$Day < "2012-03-20"),]
> 
> var.names <- list(from = 'originID', to = 'destinationID', Time = 'Day',
+                   arc = 'num.animals')
>                   
> prop.func <- c('beta * S * I / (S + I)', 'gamma * I')
> state.var <- c('S', 'I')
> state.change.matrix <- matrix(c(-1,  1,  # S
+                                  1, -1), # I
+                               nrow = 2, ncol = 2, byrow = TRUE)
>                               
> model.parms <- c(beta = 0.1, gamma = 0.01)
> 
> init.cond <- rep(100, length(unique(c(networkSample$originID,
+                                       networkSample$destinationID))))
> names(init.cond) <- paste('S', unique(c(networkSample$originID,
+                                         networkSample$destinationID)), sep = '')
> init.cond <- c(init.cond, c(I36811 = 10, I36812 = 10)) # adding infection
>                   
> # running simulations, check num of cores available (num.cores)
> sim.results <- hybridModel(network = networkSample, var.names = var.names,
+                            model.parms = model.parms, state.var = state.var,
+                            prop.func = prop.func, init.cond = init.cond,
+                            state.change.matrix = state.change.matrix,
+                            sim.number = 2, num.cores = 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: hybridModel ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted