Google Maps Extension Node Not Running

[sfc-gh-ebotwick]

Hello,

A client of mine has downloaded the "Plot Geospatial Data" extension node from the extension hub in Modeler 18.1.1 as part of a Proof of Concept. R essentials for modeler has been successfully installed and extension output nodes run ok. When running the plot geospatial data node (which calls on the PlotGoogleMaps package in R), a prompt asks for which CRAN mirror to select. After selecting one the text output of the node states 'PlotGoogleMaps' has been successfully unpackaged, but no map is created and the console output states as follows -

Loading required package: plotGoogleMaps
Loading required package: sp
Loading required package: spacetime
Error in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]) : 
  there is no package called 'rgdal'
Installing package into 'C:/Users/****/Documents/R/win-library/3.2'
(as 'lib' is unspecified)
Error in contrib.url(repos, "source") : 
  trying to use CRAN without setting a mirror
Loading required package: RColorBrewer
Please discard any warning 'n too large' from brewer.pal
Warning message:
In brewer.pal(n = min(12, number_colors), name = color_palette) :
  n too large, allowed maximum for palette Blues is 9
Returning the palette you asked for with that many colors

Error: could not find function "iconlabels"
Error: could not find function "plotGoogleMaps"
Error in shell.exec(url) : 
  'C:\Users\****\AppData\Local\Temp\RtmpuOFhA9\file40485b4c355c.htm' not found
Error in if (file.info(outputFiles[1])$size < 500) { : 
  missing value where TRUE/FALSE needed

Any help here would be appreciated - thanks!