Error(s) in re-building vignettes:
--- re-building ‘zipfr-tutorial.Rnw’ using Sweave
Error: processing vignette 'zipfr-tutorial.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'zipfr-tutorial.tex' failed.
LaTeX errors:
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.276 \includegraphics{zipfr-tutorial-011}
                                          
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.276 \includegraphics{zipfr-tutorial-011}
                                          
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.276 \includegraphics{zipfr-tutorial-011}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.276 \includegraphics{zipfr-tutorial-011}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.276 \includegraphics{zipfr-tutorial-011}
                                          
! LaTeX Error: File `zipfr-tutorial-011' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.278 \includegraphics{zipfr-tutorial-012}
                                          
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.278 \includegraphics{zipfr-tutorial-012}
                                          
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.278 \includegraphics{zipfr-tutorial-012}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.278 \includegraphics{zipfr-tutorial-012}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.278 \includegraphics{zipfr-tutorial-012}
                                          
! LaTeX Error: File `zipfr-tutorial-012' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.298 \includegraphics{zipfr-tutorial-013}
                                          
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.298 \includegraphics{zipfr-tutorial-013}
                                          
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.298 \includegraphics{zipfr-tutorial-013}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.298 \includegraphics{zipfr-tutorial-013}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.298 \includegraphics{zipfr-tutorial-013}
                                          
! LaTeX Error: File `zipfr-tutorial-013' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.421 \includegraphics{zipfr-tutorial-017}
                                          
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.421 \includegraphics{zipfr-tutorial-017}
                                          
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.421 \includegraphics{zipfr-tutorial-017}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.421 \includegraphics{zipfr-tutorial-017}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.421 \includegraphics{zipfr-tutorial-017}
                                          
! LaTeX Error: File `zipfr-tutorial-017' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.492 \includegraphics{zipfr-tutorial-019}
                                          
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.492 \includegraphics{zipfr-tutorial-019}
                                          
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.492 \includegraphics{zipfr-tutorial-019}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.492 \includegraphics{zipfr-tutorial-019}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.492 \includegraphics{zipfr-tutorial-019}
                                          
! LaTeX Error: File `zipfr-tutorial-019' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.653 \includegraphics{zipfr-tutorial-024}
                                          
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.653 \includegraphics{zipfr-tutorial-024}
                                          
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.653 \includegraphics{zipfr-tutorial-024}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.653 \includegraphics{zipfr-tutorial-024}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.653 \includegraphics{zipfr-tutorial-024}
                                          
! LaTeX Error: File `zipfr-tutorial-024' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.689 \includegraphics{zipfr-tutorial-026}
                                          
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.689 \includegraphics{zipfr-tutorial-026}
                                          
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.689 \includegraphics{zipfr-tutorial-026}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.689 \includegraphics{zipfr-tutorial-026}
        
--- failed re-building 'zipfr-tutorial.Rnw'

SUMMARY: processing the following file failed:
  'zipfr-tutorial.Rnw'

Error: Vignette re-building failed.
Execution halted