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

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `messagecolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
--- failed re-building ‘a_introduction.Rnw’

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

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `messagecolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `messagecolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <
--- failed re-building ‘b_powerlaw_examples.Rnw’

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

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
! Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
--- failed re-building ‘c_comparing_distributions.Rnw’

--- re-building ‘d_jss_paper.Rnw’ using Sweave
--- finished re-building ‘d_jss_paper.Rnw’

SUMMARY: processing the following files failed:
  ‘a_introduction.Rnw’
  ‘b_powerlaw_examples.Rnw’
  ‘c_comparing_distributions.Rnw’

Error: Vignette re-building failed.
Execution halted