Error(s) in re-building vignettes:
--- re-building ‘user-guide.Rmd’ using rmarkdown
** Processing: /data/gannet/ripley/R/packages/tests-devel/spqdep.Rcheck/vign_test/spqdep/vignettes/user-guide_files/figure-html/unnamed-chunk-5-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 28610 bytes
Input file size = 28724 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 20579
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 20579

Output IDAT size = 20579 bytes (8031 bytes decrease)
Output file size = 20657 bytes (8067 bytes = 28.08% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/spqdep.Rcheck/vign_test/spqdep/vignettes/user-guide_files/figure-html/plot mh-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 29738 bytes
Input file size = 29852 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 27111
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 27111

Output IDAT size = 27111 bytes (2627 bytes decrease)
Output file size = 27189 bytes (2663 bytes = 8.92% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/spqdep.Rcheck/vign_test/spqdep/vignettes/user-guide_files/figure-html/plot mh prune-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 28569 bytes
Input file size = 28683 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 25713
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 25713

Output IDAT size = 25713 bytes (2856 bytes decrease)
Output file size = 25791 bytes (2892 bytes = 10.08% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/spqdep.Rcheck/vign_test/spqdep/vignettes/user-guide_files/figure-html/unnamed-chunk-10-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 27983 bytes
Input file size = 28097 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 19688
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 19688

Output IDAT size = 19688 bytes (8295 bytes decrease)
Output file size = 19766 bytes (8331 bytes = 29.65% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/spqdep.Rcheck/vign_test/spqdep/vignettes/user-guide_files/figure-html/unnamed-chunk-10-2.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 21469 bytes
Input file size = 21571 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 15352
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 15352

Output IDAT size = 15352 bytes (6117 bytes decrease)
Output file size = 15430 bytes (6141 bytes = 28.47% decrease)


Quitting from lines 273-279 [unnamed-chunk-11] (user-guide.Rmd)
Error: processing vignette 'user-guide.Rmd' failed with diagnostics:
no applicable method for 'units' applied to an object of class "NULL"
--- failed re-building ‘user-guide.Rmd’

SUMMARY: processing the following file failed:
  ‘user-guide.Rmd’

Error: Vignette re-building failed.
Execution halted