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

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### 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)
> 
> # default plot layout (plot.types: 'pop.mean', 'subpop', or 'subpop.mean')
> plot(sim.results, plot.type = 'subpop.mean')
Error in Summary.unit(c(4.4, 4.4), na.rm = FALSE) : 
  VECTOR_ELT() can only be applied to a 'list', not a 'double'
Calls: <Anonymous> ... render_strips -> build_strip -> ggstrip -> Summary.unit
Execution halted