Error(s) in re-building vignettes:
--- re-building ‘howto_relational_db.rmd’ using rmarkdown

Quitting from lines 126-131 [unnamed-chunk-6] (howto_relational_db.rmd)
Error: processing vignette 'howto_relational_db.rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘howto_relational_db.rmd’

--- re-building ‘howto_relational_db_dm.rmd’ using rmarkdown
** Processing: /data/gannet/ripley/R/packages/tests-devel/editbl.Rcheck/vign_test/editbl/vignettes/howto_relational_db_dm_files/figure-html/unnamed-chunk-9-1.png
700x74 pixels, 3x8 bits/pixel, RGB
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 1985 bytes
Input file size = 2055 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 818
  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 = 818

Output IDAT size = 818 bytes (1167 bytes decrease)
Output file size = 888 bytes (1167 bytes = 56.79% decrease)

--- finished re-building ‘howto_relational_db_dm.rmd’

--- re-building ‘howto_switch_from_DT.rmd’ using rmarkdown
** Processing: /data/gannet/ripley/R/packages/tests-devel/editbl.Rcheck/vign_test/editbl/vignettes/howto_switch_from_DT_files/figure-html/unnamed-chunk-2-1.png
685x625 pixels, 3x8 bits/pixel, RGB
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 59189 bytes
Input file size = 59343 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 23403
  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 = 23403

Output IDAT size = 23403 bytes (35786 bytes decrease)
Output file size = 23473 bytes (35870 bytes = 60.45% decrease)

** Processing: /data/gannet/ripley/R/packages/tests-devel/editbl.Rcheck/vign_test/editbl/vignettes/howto_switch_from_DT_files/figure-html/unnamed-chunk-3-1.png
700x133 pixels, 3x8 bits/pixel, RGB
Reducing image to 8 bits/pixel, 244 colors in palette
Input IDAT size = 13677 bytes
Input file size = 13759 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 5447
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 5444
  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 = 1  f = 0		IDAT size = 5444

Output IDAT size = 5444 bytes (8233 bytes decrease)
Output file size = 6258 bytes (7501 bytes = 54.52% decrease)

--- finished re-building ‘howto_switch_from_DT.rmd’

SUMMARY: processing the following file failed:
  ‘howto_relational_db.rmd’

Error: Vignette re-building failed.
Execution halted