Error(s) in re-building vignettes:
  ...
--- re-building 'OTclust.Rmd' using rmarkdown
Quitting from lines 151-162 (OTclust.Rmd) 
Error: processing vignette 'OTclust.Rmd' failed with diagnostics:
the condition has length > 1
--- failed re-building 'OTclust.Rmd'

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘OTclust.Rmd’ using rmarkdown
Quitting from lines 151-162 (OTclust.Rmd) 
Error: processing vignette ‘OTclust.Rmd’ failed with diagnostics:
the condition has length > 1
--- failed re-building ‘OTclust.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘OTclust.Rmd’ using rmarkdown
Quitting from lines 151-162 (OTclust.Rmd) 
Error: processing vignette 'OTclust.Rmd' failed with diagnostics:
the condition has length > 1
--- failed re-building ‘OTclust.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘OTclust.Rmd’ using rmarkdown
Quitting from lines 151-162 (OTclust.Rmd) 
Error: processing vignette 'OTclust.Rmd' failed with diagnostics:
the condition has length > 1
--- failed re-building ‘OTclust.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'OTclust.Rmd' using rmarkdown
Quitting from lines 151-162 (OTclust.Rmd) 
Error: processing vignette 'OTclust.Rmd' failed with diagnostics:
the condition has length > 1
--- failed re-building 'OTclust.Rmd'

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'OTclust.Rmd' using rmarkdown
Quitting from lines 151-162 (OTclust.Rmd) 
Error: processing vignette 'OTclust.Rmd' failed with diagnostics:
the condition has length > 1
--- failed re-building 'OTclust.Rmd'

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

Error: Vignette re-building failed.
Execution halted