[R] Error with "compiler" and "caret" packages

[Jeff Hughes]

Hi there,

I have been getting an irritating error when trying to use the "caret"
package on one of my machines. Whenever I train any model whatsoever, it
comes back with this error:

Warning: namespace ‘compiler’ is not available and has been replaced
by .GlobalEnv when processing object ‘sep’
Error in comp(expr, env = envir, options = list(suppressUndefined = TRUE))
:
  could not find function "makeCenv"

As a result, the model does not work, and I am unable to use the caret
package. As an example, here is some code that causes the error, though it
has happened in every case I have tried:

library(caret)
fit.knn <- train(Species ~ ., data=iris, method="knn")

I have tried reinstalling the caret package; I have tried reinstalling R; I
have tried updating all of my packages; nothing has worked. What's more,
this machine is running Windows 10, and I have successfully run the same
code on two other machines running the same version of Windows, the same
version of R, and the same version of the caret package. I have also only
run into it when using caret, but I don't think the error lies within that
package itself.

Here is my sessionInfo() after running the above code in a new R session:

R version 3.3.2 (2016-10-31)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United
States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United
States.1252

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

other attached packages:
[1] caret_6.0-73    ggplot2_2.2.1   lattice_0.20-34

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.8        magrittr_1.5       splines_3.3.2      MASS_7.3-45
     munsell_0.4.3      colorspace_1.3-2
 [7] foreach_1.4.3      minqa_1.2.4        stringr_1.1.0      car_2.1-4
     plyr_1.8.4         tools_3.3.2
[13] parallel_3.3.2     nnet_7.3-12        pbkrtest_0.4-6     grid_3.3.2
      gtable_0.2.0       nlme_3.1-128
[19] mgcv_1.8-16        quantreg_5.29      e1071_1.6-7        class_7.3-14
      MatrixModels_0.4-1 iterators_1.0.8
[25] lme4_1.1-12        lazyeval_0.2.0     assertthat_0.1     tibble_1.2
      Matrix_1.2-7.1     nloptr_1.0.4
[31] reshape2_1.4.2     ModelMetrics_1.1.0 codetools_0.2-15   stringi_1.1.2
     scales_0.4.1       stats4_3.3.2
[37] SparseM_1.74

Note that the "compiler" package is not loaded for some reason, which I
think it should be (the other machines on which this runs successfully have
it loaded). But the compiler package is built-in, so I can't seem to find a
way to load it manually.

This one has really stumped me, and there are very few relevant hits on
Google. Any help would be much appreciated!

Jeff

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