Error(s) in re-building vignettes:
--- re-building ‘usl.Rnw’ using knitr
Warning: 'data' shows efficiency > 1; this looks almost too good to be true
Error: processing vignette 'usl.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'usl.tex' failed.
LaTeX errors:
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.286 ...hics[width=0.97\textwidth]{usl-rtplot2-1}
                                                  
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.286 ...hics[width=0.97\textwidth]{usl-rtplot2-1}
                                                  
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.286 ...hics[width=0.97\textwidth]{usl-rtplot2-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.286 ...hics[width=0.97\textwidth]{usl-rtplot2-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.286 ...hics[width=0.97\textwidth]{usl-rtplot2-1}
                                                  
! LaTeX Error: File `usl-rtplot2-1' 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.400 ...cs[width=0.97\textwidth]{usl-rtbarplot-1}
                                                  
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.400 ...cs[width=0.97\textwidth]{usl-rtbarplot-1}
                                                  
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.400 ...cs[width=0.97\textwidth]{usl-rtbarplot-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.400 ...cs[width=0.97\textwidth]{usl-rtbarplot-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.400 ...cs[width=0.97\textwidth]{usl-rtbarplot-1}
                                                  
! LaTeX Error: File `usl-rtbarplot-1' 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.464 ...hics[width=0.97\textwidth]{usl-rtplot3-1}
                                                  
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.464 ...hics[width=0.97\textwidth]{usl-rtplot3-1}
                                                  
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.464 ...hics[width=0.97\textwidth]{usl-rtplot3-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.464 ...hics[width=0.97\textwidth]{usl-rtplot3-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.464 ...hics[width=0.97\textwidth]{usl-rtplot3-1}
                                                  
! LaTeX Error: File `usl-rtplot3-1' 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.696 ...hics[width=0.97\textwidth]{usl-spplot2-1}
                                                  
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.696 ...hics[width=0.97\textwidth]{usl-spplot2-1}
                                                  
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.696 ...hics[width=0.97\textwidth]{usl-spplot2-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.696 ...hics[width=0.97\textwidth]{usl-spplot2-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.696 ...hics[width=0.97\textwidth]{usl-spplot2-1}
                                                  
! LaTeX Error: File `usl-spplot2-1' 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.800 ...hics[width=0.97\textwidth]{usl-ciplot1-1}
                                                  
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.800 ...hics[width=0.97\textwidth]{usl-ciplot1-1}
                                                  
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.800 ...hics[width=0.97\textwidth]{usl-ciplot1-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.800 ...hics[width=0.97\textwidth]{usl-ciplot1-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.800 ...hics[width=0.97\textwidth]{usl-ciplot1-1}
                                                  
! LaTeX Error: File `usl-ciplot1-1' 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.890 ...hics[width=0.97\textwidth]{usl-ovplot1-1}
                                                  
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.890 ...hics[width=0.97\textwidth]{usl-ovplot1-1}
                                                  
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.890 ...hics[width=0.97\textwidth]{usl-ovplot1-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.890 ...hics[width=0.97\textwidth]{usl-ovplot1-1}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.890 ...hics[width=0.97\textwidth]{usl-ovplot1-1}
                                                  
! LaTeX Error: File `usl-ovplot1-1' 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.964 ...ics[width=0.97\textwidth]{usl-oraplot1-1}
                                                  
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                          
--- failed re-building ‘usl.Rnw’

SUMMARY: processing the following file failed:
  ‘usl.Rnw’

Error: Vignette re-building failed.
Execution halted