Error(s) in re-building vignettes:
  ...
--- re-building ‘SpatialPosition.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Error in (function (x)  : attempt to apply non-function
Error in (function (x)  : attempt to apply non-function
Error in (function (x)  : attempt to apply non-function
--- finished re-building ‘SpatialPosition.Rmd’

--- re-building ‘StewartExample.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 29-68 (StewartExample.Rmd) 
Error: processing vignette 'StewartExample.Rmd' failed with diagnostics:
invalid crs: PROJCRS["ETRS89-extended / LAEA Europe",
    BASEGEOGCRS["ETRS89",
        DATUM["European Terrestrial Reference System 1989",
            ELLIPSOID["GRS 1980",6378137,298.257222101,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4258]],
    CONVERSION["Europe Equal Area 2001",
        METHOD["Lambert Azimuthal Equal Area",
            ID["EPSG",9820]],
        PARAMETER["Latitude of natural origin",52,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",10,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8802]],
        PARAMETER["False easting",4321000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",3210000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]],
        ID["EPSG",19986]],
    CS[Cartesian,2],
        AXIS["(E)",east,
            ORDER[1],
            LENGTHUNIT["metre",1,
                ID["EPSG",9001]]],
        AXIS["(N)",north,
            ORDER[2],
            LENGTHUNIT["metre",1,
                ID["EPSG",9001]]],
    USAGE[
        SCOPE["unknown"],
        AREA["Europe - LCC & LAEA"],
        BBOX[24.6,-35.58,84.17,44.83]]]
--- failed re-building ‘StewartExample.Rmd’

SUMMARY: processing the following file failed:
  ‘StewartExample.Rmd’

Error: Vignette re-building failed.
Execution halted