example(xvalPoly) throws error

I have been trying to run (working) code from a colleague on two different ubuntu machines. I can't get their code to run, and I can't even get the xvalPoly example to run.

Here is the unexpected error, followed by the complete R session in which it was produced (with sessionInfo). I get similar results from another machine. I'm not aware of anything weird I've done.

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example(xvalPoly)

xvlPly> y <- mtcars[,1]

xvlPly> data <- cbind(mtcars[,-1], y) # make y column the last column

xvlPly> pf1 <- xvalPoly(data,2,2,"lm",0.8,FALSE)
Error in polyFit(training, i, m, use, pcaMethod, pcaLocation, pcaPortion, :
pcaMethod should be either NULL, prcomp, or RSpectra

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library(polyreg)
Loading required package: regtools
Loading required package: FNN
Loading required package: mvtnorm
Loading required package: dummies
dummies-1.5.6 provided by Decision Patterns

Loading required package: car
Loading required package: carData

packageVersion("polyreg")
[1] ‘0.2’
example(xvalPoly)

xvlPly> y <- mtcars[,1]

xvlPly> data <- cbind(mtcars[,-1], y) # make y column the last column

xvlPly> pf1 <- xvalPoly(data,2,2,"lm",0.8,FALSE)
Error in polyFit(training, i, m, use, pcaMethod, pcaLocation, pcaPortion, :
pcaMethod should be either NULL, prcomp, or RSpectra

sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.1 LTS

Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/openblas/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/libopenblasp-r0.2.20.so

locale:
[1] LC_CTYPE=en_CA.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_CA.UTF-8 LC_COLLATE=en_CA.UTF-8
[5] LC_MONETARY=en_CA.UTF-8 LC_MESSAGES=en_CA.UTF-8
[7] LC_PAPER=en_CA.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] polyreg_0.2 regtools_1.0.1 car_3.0-2 carData_3.0-1 dummies_1.5.6
[6] mvtnorm_1.0-8 FNN_1.1.2.1

loaded via a namespace (and not attached):
[1] Rcpp_1.0.0 rio_0.5.10 crayon_1.3.4 cellranger_1.1.0
[5] magrittr_1.5 zip_1.0.0 pillar_1.3.0 rlang_0.2.2
[9] readxl_1.1.0 curl_3.2 data.table_1.11.4 openxlsx_4.1.0
[13] tools_3.5.1 forcats_0.3.0 foreign_0.8-71 hms_0.4.2
[17] abind_1.4-5 compiler_3.5.1 pkgconfig_2.0.2 haven_1.1.2
[21] tibble_1.4.2

Start by reproducing example(xvalPoly) in an R session using the reported call and inspect the xvalPoly and polyFit entry points, especially pcaMethod handling. The issue is done when the documented example runs without the reported pcaMethod error.