Error(s) in re-building vignettes:
  ...
--- re-building ‘Introduction.Rmd’ using rmarkdown
Quitting from lines 153-160 (Introduction.Rmd) 
Error: processing vignette ‘Introduction.Rmd’ failed with diagnostics:
‘to’ must be a finite number
--- failed re-building ‘Introduction.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘Introduction.Rmd’ using rmarkdown
Quitting from lines 153-160 (Introduction.Rmd) 
Error: processing vignette ‘Introduction.Rmd’ failed with diagnostics:
‘to’ must be a finite number
--- failed re-building ‘Introduction.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘Introduction.Rmd’ using rmarkdown
Quitting from lines 153-160 (Introduction.Rmd) 
Error: processing vignette 'Introduction.Rmd' failed with diagnostics:
'to' must be a finite number
--- failed re-building ‘Introduction.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘Introduction.Rmd’ using rmarkdown
Quitting from lines 153-160 (Introduction.Rmd) 
Error: processing vignette 'Introduction.Rmd' failed with diagnostics:
'to' must be a finite number
--- failed re-building ‘Introduction.Rmd’

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

Error: Vignette re-building failed.
Execution halted