Error(s) in re-building vignettes:
  ...
--- re-building 'algorithm.Rmd' using rmarkdown
--- finished re-building 'algorithm.Rmd'

--- re-building 'citation.Rmd' using rmarkdown
Quitting from lines 186-188 (citation.Rmd) 
Error: processing vignette 'citation.Rmd' failed with diagnostics:
invalid 'size' argument
--- failed re-building 'citation.Rmd'

SUMMARY: processing the following file failed:
  'citation.Rmd'

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘algorithm.Rmd’ using rmarkdown
--- finished re-building ‘algorithm.Rmd’

--- re-building ‘citation.Rmd’ using rmarkdown
Quitting from lines 186-188 (citation.Rmd) 
Error: processing vignette ‘citation.Rmd’ failed with diagnostics:
invalid ‘size’ argument
--- failed re-building ‘citation.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘algorithm.Rmd’ using rmarkdown
--- finished re-building ‘algorithm.Rmd’

--- re-building ‘citation.Rmd’ using rmarkdown
Quitting from lines 186-188 (citation.Rmd) 
Error: processing vignette 'citation.Rmd' failed with diagnostics:
invalid 'size' argument
--- failed re-building ‘citation.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘algorithm.Rmd’ using rmarkdown
--- finished re-building ‘algorithm.Rmd’

--- re-building ‘citation.Rmd’ using rmarkdown
Quitting from lines 186-188 (citation.Rmd) 
Error: processing vignette 'citation.Rmd' failed with diagnostics:
invalid 'size' argument
--- failed re-building ‘citation.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'algorithm.Rmd' using rmarkdown
--- finished re-building 'algorithm.Rmd'

--- re-building 'citation.Rmd' using rmarkdown
Quitting from lines 186-188 (citation.Rmd) 
Error: processing vignette 'citation.Rmd' failed with diagnostics:
invalid 'size' argument
--- failed re-building 'citation.Rmd'

SUMMARY: processing the following file failed:
  'citation.Rmd'

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'algorithm.Rmd' using rmarkdown
--- finished re-building 'algorithm.Rmd'

--- re-building 'citation.Rmd' using rmarkdown
Quitting from lines 186-188 (citation.Rmd) 
Error: processing vignette 'citation.Rmd' failed with diagnostics:
invalid 'size' argument
--- failed re-building 'citation.Rmd'

SUMMARY: processing the following file failed:
  'citation.Rmd'

Error: Vignette re-building failed.
Execution halted