Error(s) in re-building vignettes:
  ...
--- re-building ‘intro_ipeaplot.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/ipeaplot.Rcheck/vign_test/ipeaplot/vignettes/intro_ipeaplot_files/figure-html/unnamed-chunk-5-1.png
960x768 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 11959 bytes
Input file size = 12049 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0
  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		IDAT size = 10738
  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 = 5		IDAT size = 10738

Output IDAT size = 10738 bytes (1221 bytes decrease)
Output file size = 10816 bytes (1233 bytes = 10.23% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/ipeaplot.Rcheck/vign_test/ipeaplot/vignettes/intro_ipeaplot_files/figure-html/unnamed-chunk-6-1.png
960x768 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 14916 bytes
Input file size = 15006 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0
  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		IDAT size = 13385
  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 = 5		IDAT size = 13385

Output IDAT size = 13385 bytes (1531 bytes decrease)
Output file size = 13463 bytes (1543 bytes = 10.28% decrease)


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Quitting from lines 215-227 [unnamed-chunk-13] (intro_ipeaplot.Rmd)
Error: processing vignette 'intro_ipeaplot.Rmd' failed with diagnostics:
no applicable method for 'left_join' applied to an object of class "NULL"
--- failed re-building ‘intro_ipeaplot.Rmd’

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

Error: Vignette re-building failed.
Execution halted