[R] Unexpected YAML

[JLucke m@ili@g off ri@@buff@lo@edu]

R Users:

Whenever I fire up R, I now get the following message (red) at the end of 
the prologue.

R version 3.5.1 (2018-07-02) -- "Feather Spray"
Copyright (C) 2018 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

Error in loadNamespace(name) : there is no package called ‘yaml’

How do I get rid of it?
Joe

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