Error(s) in re-building vignettes:
--- re-building ‘trapezoid.Rnw’ using Sweave
Loading required package: trapezoid
Loading required package: plyr
Loading required package: ggplot2
Error: processing vignette 'trapezoid.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'trapezoid.tex' failed.
LaTeX errors:
! Undefined control sequence.
\Ginclude@graphics ...\Ginput@path \set@curr@file 
                                                  {#1}\edef \uq@curr@file {\...
l.110 \includegraphics{trapezoid-trapezoid}
                                           
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.110 \includegraphics{trapezoid-trapezoid}
                                           
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.110 \includegraphics{trapezoid-trapezoid}
                                           
! Undefined control sequence.
<recently read> \quote@name 
                            
l.110 \includegraphics{trapezoid-trapezoid}
                                           
! Undefined control sequence.
<recently read> \quote@name 
                            
l.110 \includegraphics{trapezoid-trapezoid}
                                           
! LaTeX Error: File `trapezoid-trapezoid' 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.132 \includegraphics{trapezoid-triangle}
                                          
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.132 \includegraphics{trapezoid-triangle}
                                          
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.132 \includegraphics{trapezoid-triangle}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.132 \includegraphics{trapezoid-triangle}
                                          
! Undefined control sequence.
<recently read> \quote@name 
                            
l.132 \includegraphics{trapezoid-triangle}
                                          
! LaTeX Error: File `trapezoid-triangle' 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.177 ...graphics{trapezoid-generalizedTrapezoids}
                                                  
! Undefined control sequence.
\Ginclude@graphics ...e \expandafter {\@curr@file 
                                                  }}\expandafter \filename@p...
l.177 ...graphics{trapezoid-generalizedTrapezoids}
                                                  
! Undefined control sequence.
<recently read> \unquote@name 
                              
l.177 ...graphics{trapezoid-generalizedTrapezoids}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.177 ...graphics{trapezoid-generalizedTrapezoids}
                                                  
! Undefined control sequence.
<recently read> \quote@name 
                            
l.177 ...graphics{trapezoid-generalizedTrapezoids}
                                                  
! LaTeX Error: File `trapezoid-generalizedTrapezoids' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
--- failed re-building ‘trapezoid.Rnw’

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

Error: Vignette re-building failed.
Execution halted