Error(s) in re-building vignettes:
  ...
duplicated vignette title:
  ‘Example with SPSS dataset’

--- re-building ‘codebook.Rmd’ using rmarkdown
--- finished re-building ‘codebook.Rmd’

--- re-building ‘codebook_labelled_manual.Rmd’ using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building ‘codebook_labelled_manual.Rmd’

--- re-building ‘codebook_nested_scale.Rmd’ using rmarkdown
--- finished re-building ‘codebook_nested_scale.Rmd’

--- re-building ‘codebook_qualtrics.Rmd’ using rmarkdown
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning in if (grepl("labelled", class(x[[i]]))) { :
  the condition has length > 1 and only the first element will be used
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
Warning: Unknown or uninitialised column: 'foreign'.
--- finished re-building ‘codebook_qualtrics.Rmd’

--- re-building ‘codebook_sav.Rmd’ using rmarkdown
--- finished re-building ‘codebook_sav.Rmd’

--- re-building ‘codebook_tutorial.Rmd’ using rmarkdown
Warning in detect_scales(codebook_data) :
  A items found, but no aggregate
Warning in detect_scales(codebook_data) :
  C items found, but no aggregate
Warning in detect_scales(codebook_data) :
  E items found, but no aggregate
Warning in detect_scales(codebook_data) :
  N items found, but no aggregate
Warning in detect_scales(codebook_data) :
  O items found, but no aggregate
Warning in codebook(codebook_data) :
  The variables session, created, ended have to be defined for automatic survey repetition detection to work. Set to no repetition by default.
--- finished re-building ‘codebook_tutorial.Rmd’

Error: Duplicate vignette titles.
  Ensure that the %\VignetteIndexEntry lines in the vignette sources
  correspond to the vignette titles.
Execution halted