Package suggested but not available for checking: ‘ptmixed’
Error(s) in re-building vignettes:
  ...
--- re-building ‘pencal-vignette.Rmd’ using rmarkdown
Quitting from lines 158-167 (pencal-vignette.Rmd) 
Error: processing vignette 'pencal-vignette.Rmd' failed with diagnostics:
there is no package called 'ptmixed'
--- failed re-building ‘pencal-vignette.Rmd’

SUMMARY: processing the following file failed:
  ‘pencal-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted
Package suggested but not available for checking: ‘ptmixed’
Error(s) in re-building vignettes:
  ...
--- re-building ‘pencal-vignette.Rmd’ using rmarkdown
Quitting from lines 158-167 (pencal-vignette.Rmd) 
Error: processing vignette 'pencal-vignette.Rmd' failed with diagnostics:
there is no package called 'ptmixed'
--- failed re-building ‘pencal-vignette.Rmd’

SUMMARY: processing the following file failed:
  ‘pencal-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted
Package suggested but not available for checking: ‘ptmixed’
Error(s) in re-building vignettes:
  ...
--- re-building ‘pencal-vignette.Rmd’ using rmarkdown
Quitting from lines 158-167 (pencal-vignette.Rmd) 
Error: processing vignette 'pencal-vignette.Rmd' failed with diagnostics:
there is no package called 'ptmixed'
--- failed re-building ‘pencal-vignette.Rmd’

SUMMARY: processing the following file failed:
  ‘pencal-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted
Package suggested but not available for checking: ‘ptmixed’
Error(s) in re-building vignettes:
  ...
--- re-building ‘pencal-vignette.Rmd’ using rmarkdown
Quitting from lines 158-167 (pencal-vignette.Rmd) 
Error: processing vignette 'pencal-vignette.Rmd' failed with diagnostics:
there is no package called 'ptmixed'
--- failed re-building ‘pencal-vignette.Rmd’

SUMMARY: processing the following file failed:
  ‘pencal-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted