Error(s) in re-building vignettes:
  ...
--- re-building ‘doby.rnw’ using knitr
Error: processing vignette 'doby.rnw' failed with diagnostics:
Running 'texi2dvi' on 'doby.tex' failed.
LaTeX errors:
! Undefined control sequence.
l.140 \hldef
            {> }\hlkwd{head}\hldef{(mtcars)}
? 
! Emergency stop.
! Emergency stop.
l.140 
      
End of file on the terminal!

!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘doby.rnw’

--- re-building ‘linest_lsmeans.rnw’ using knitr
Error: processing vignette 'linest_lsmeans.rnw' failed with diagnostics:
Running 'texi2dvi' on 'linest_lsmeans.tex' failed.
LaTeX errors:
! Undefined control sequence.
l.159 \hldef
            {> }\hlkwd{lm}\hldef{( y} \hlopt{~} \hldef{treat} \hlopt{+} \hld...

? 
! Emergency stop.
l.159 
      
End of file on the terminal!

!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘linest_lsmeans.rnw’

--- re-building ‘model_stability.rmd’ using knitr
** Processing: figure/unnamed-chunk-8-1.png
504x504 pixels, 8 bits/pixel, 254 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 4409 bytes
Input file size = 5261 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 3617
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 3614
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 3614

Output IDAT size = 3614 bytes (795 bytes decrease)
Output file size = 3692 bytes (1569 bytes = 29.82% decrease)

** Processing: figure/unnamed-chunk-9-1.png
504x504 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 8156 bytes
Input file size = 9014 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 6413
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 6413

Output IDAT size = 6413 bytes (1743 bytes decrease)
Output file size = 6491 bytes (2523 bytes = 27.99% decrease)

--- finished re-building ‘model_stability.rmd’

--- re-building ‘section_fun.rmd’ using knitr
--- finished re-building ‘section_fun.rmd’

SUMMARY: processing the following files failed:
  ‘doby.rnw’ ‘linest_lsmeans.rnw’

Error: Vignette re-building failed.
Execution halted