Error(s) in re-building vignettes:
  ...
--- re-building ‘paper.Rnw’ using knitr
Error: processing vignette 'paper.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'paper.tex' failed.
LaTeX errors:
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Emergency stop.
 ...                                              
                                                  
l.267 ...{rgb}{0.969, 0.969, 0.969}\color{fgcolor}
                                                  \begin{kframe}
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘paper.Rnw’

--- re-building ‘tolatex-examples.Rnw’ using knitr
Warning in wilcox.test.default(x = c(-2.17390550005803e-11, -2.17097451127302e-11,  :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = c(2.13309370167281e-11, 2.12594386539422e-11,  :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = c(1.99236183107132e-11, 1.97388771994156e-11,  :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = c(1.00897068477934e-12, 1.02406971791424e-12,  :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = c(8.95727936267576e-13, 8.4909856923332e-13,  :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = c(9.80548975348938e-13, 8.81072992342524e-13,  :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = c(5.90887339058099e-11, 6.09077233093558e-11,  :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = c(9.97119053991469e-15, 9.92695509127728e-15,  :
  cannot compute exact p-value with ties
Error: processing vignette 'tolatex-examples.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'tolatex-examples.tex' failed.
LaTeX errors:
! Package xcolor Error: Undefined color `shadecolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Emergency stop.
 ...                                              
                                                  
l.81 \begin{kframe}
                   
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘tolatex-examples.Rnw’

SUMMARY: processing the following files failed:
  ‘paper.Rnw’ ‘tolatex-examples.Rnw’

Error: Vignette re-building failed.
Execution halted