Error(s) in re-building vignettes:
--- re-building ‘FRK_intro.Rnw’ using knitr
** Processing: figure/unnamed-chunk-27-1.png
600x600 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 101126 bytes
Input file size = 102128 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 98819
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 97935
  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 = 97935

Output IDAT size = 97935 bytes (3191 bytes decrease)
Output file size = 98013 bytes (4115 bytes = 4.03% decrease)

** Processing: figure/unnamed-chunk-27-2.png
600x600 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 60504 bytes
Input file size = 61446 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 56931
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 56624
  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 = 56624

Output IDAT size = 56624 bytes (3880 bytes decrease)
Output file size = 56702 bytes (4744 bytes = 7.72% decrease)

** Processing: figure/unnamed-chunk-31-1.png
490x245 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 121074 bytes
Input file size = 121320 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 83414
  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 = 83414

Output IDAT size = 83414 bytes (37660 bytes decrease)
Output file size = 83492 bytes (37828 bytes = 31.18% decrease)

** Processing: figure/unnamed-chunk-32-1.png
490x245 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 87524 bytes
Input file size = 87722 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 65996
  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 = 65996

Output IDAT size = 65996 bytes (21528 bytes decrease)
Output file size = 66074 bytes (21648 bytes = 24.68% decrease)

** Processing: figure/unnamed-chunk-33-1.png
490x245 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 89412 bytes
Input file size = 89610 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 65611
  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 = 65611

Output IDAT size = 65611 bytes (23801 bytes decrease)
Output file size = 65689 bytes (23921 bytes = 26.69% decrease)

** Processing: figure/unnamed-chunk-60-1.png
1120x210 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 188097 bytes
Input file size = 188439 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 136399
  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 = 136399

Output IDAT size = 136399 bytes (51698 bytes decrease)
Output file size = 136477 bytes (51962 bytes = 27.57% decrease)

** Processing: figure/unnamed-chunk-61-1.png
1120x210 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 131543 bytes
Input file size = 131813 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 110732
  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 = 110732

Output IDAT size = 110732 bytes (20811 bytes decrease)
Output file size = 110810 bytes (21003 bytes = 15.93% decrease)

** Processing: figure/unnamed-chunk-62-1.png
1120x210 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 123063 bytes
Input file size = 123321 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 111022
  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 = 111022

Output IDAT size = 111022 bytes (12041 bytes decrease)
Output file size = 111100 bytes (12221 bytes = 9.91% decrease)

Error: processing vignette 'FRK_intro.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'FRK_intro.tex' failed.
LaTeX errors:
! Undefined control sequence.
l.315 \hlkwd{library}\hldef
                           {(sp)}        \hlcom{# for defining points/polygons}

? 
! Emergency stop.
l.315 
      
End of file on the terminal!

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

--- re-building ‘FRK_non-Gaussian.Rnw’ using knitr
Error: processing vignette 'FRK_non-Gaussian.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'FRK_non-Gaussian.tex' failed.
LaTeX errors:
! Undefined control sequence.
l.387 \hlkwd{library}\hldef
                           {(}\hlsng{"FRK"}\hldef{)}       \hlcom{# for carr...

? 
! Emergency stop.
l.387 
      
End of file on the terminal!

!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘FRK_non-Gaussian.Rnw’

SUMMARY: processing the following files failed:
  ‘FRK_intro.Rnw’ ‘FRK_non-Gaussian.Rnw’

Error: Vignette re-building failed.
Execution halted