Error(s) in re-building vignettes:
  ...
--- re-building ‘chapter01-HortonMosaic.Rnw’ using knitr
--- finished re-building ‘chapter01-HortonMosaic.Rnw’

--- re-building ‘chapter02-HortonMosaic.Rnw’ using knitr
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--- finished re-building ‘chapter03-HortonMosaic.Rnw’

--- re-building ‘chapter04-HortonMosaic.Rnw’ using knitr
Warning in wilcox.test.default(x = DATA[[1L]], y = DATA[[2L]], ...) :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = DATA[[1L]], y = DATA[[2L]], ...) :
  cannot compute exact confidence intervals with ties
Warning in wilcox.test.default(x = DATA[[1L]], y = DATA[[2L]], ...) :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = DATA[[1L]], y = DATA[[2L]], ...) :
  cannot compute exact confidence intervals with ties
Warning in wilcox.test.default(x = DATA[[1L]], y = DATA[[2L]], ...) :
  cannot compute exact p-value with ties
Warning in wilcox.test.default(x = DATA[[1L]], y = DATA[[2L]], ...) :
  cannot compute exact confidence intervals with ties
--- finished re-building ‘chapter04-HortonMosaic.Rnw’

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Quitting from lines 232-235 [unnamed-chunk-6] (chapter12-HortonMosaic.Rnw)
Error: processing vignette 'chapter12-HortonMosaic.Rnw' failed with diagnostics:
could not find function "scatterplotMatrix"
--- failed re-building ‘chapter12-HortonMosaic.Rnw’

--- re-building ‘chapter13-HortonMosaic.Rnw’ using knitr
--- finished re-building ‘chapter13-HortonMosaic.Rnw’

SUMMARY: processing the following file failed:
  ‘chapter12-HortonMosaic.Rnw’

Error: Vignette re-building failed.
Execution halted