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

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: colorChart
> ### Title: Visualize soil colors in Munsell notation according to
> ###   within-group frequency.
> ### Aliases: colorChart
> 
> ### ** Examples
> 
> 
> # required for latticeExtra:useOuterStrips
> if(!requireNamespace('latticeExtra')) {
+   
+   # two hue pages
+   ric <- expand.grid(
+     hue = c('5YR', '7.5YR'),
+     value = 2:8,
+     chroma = 2:8
+   )
+   
+   # combine hue, value, chroma into standard Munsell notation
+   ric <- sprintf("%s %s/%s", ric$hue, ric$value, ric$chroma)
+   
+   # note that chip frequency-based size is disabled 
+   # because all chips have equal frequency
+   colorChart(ric, chip.cex = 4, size = TRUE)
+   
+   # annotation of frequency
+   colorChart(ric, chip.cex = 4, annotate = TRUE)
+   
+   
+   # bootstrap to larger size
+   ric.big <- sample(ric, size = 100, replace = TRUE)
+   
+   # frequency can be encoded in size
+   colorChart(ric.big, chip.cex = 3)
+   colorChart(ric.big, chip.cex = 5, annotate = TRUE)
+      
+   # constant size
+   colorChart(ric.big, chip.cex = 3, size = FALSE)
+   colorChart(ric.big, chip.cex = 3, size = FALSE, chip.border.col = 'NA')
+   
+   # simulate colors based dE00 thresholding
+   p <- list(
+     list(m = '10YR 4/4', thresh = 10, hues = c('10YR', '7.5YR'))
+   )
+   
+   # perform 500 simulations
+   s <- simulateColor(method = 'dE00', n = 500, parameters = p)
+   
+   # result is a list, use the first element
+   colorChart(s[[1]], chip.cex = 4)
+   
+   # increase the possible range of color chip sizes
+   colorChart(s[[1]], chip.cex = 4, chip.cex.min = 0.01, chip.cex.max = 2)
+   
+   # slightly funky support for neutral hues
+   N <- sprintf('N %s/', 2:8)
+   cols <- c(rep(N, times = 5), ric.big)
+   
+   # note special panel used to show neutral hues
+   colorChart(cols, size = FALSE, annotate = TRUE)
+   
+ }
Loading required namespace: latticeExtra
Failed with error:  ‘there is no package called ‘latticeExtra’’
Error: pleast install the `latticeExtra` and `scales` packages.
Execution halted