Error in re-building vignettes:
  ...
Loading required package: SweaveListingUtils
Loading required package: startupmsg
:startupmsg>  Utilities for Start-Up Messages (version 0.9.4)
:startupmsg> 
:startupmsg>  For more information see ?"startupmsg",
:startupmsg>  NEWS("startupmsg")

:SweaveListingUtils>  Utilities for Sweave Together with
:SweaveListingUtils>  TeX 'listings' Package (version
:SweaveListingUtils>  0.7.7)
:SweaveListingUtils> 
:SweaveListingUtils>  NOTE: Support for this package
:SweaveListingUtils>  will stop soon.
:SweaveListingUtils> 
:SweaveListingUtils>  Package 'knitr' is providing the
:SweaveListingUtils>  same functionality in a better
:SweaveListingUtils>  way.
:SweaveListingUtils> 
:SweaveListingUtils>  Some functions from package 'base'
:SweaveListingUtils>  are intentionally masked ---see
:SweaveListingUtils>  SweaveListingMASK().
:SweaveListingUtils> 
:SweaveListingUtils>  Note that global options are
:SweaveListingUtils>  controlled by
:SweaveListingUtils>  SweaveListingoptions() ---c.f.
:SweaveListingUtils>  ?"SweaveListingoptions".
:SweaveListingUtils> 
:SweaveListingUtils>  For more information see
:SweaveListingUtils>  ?"SweaveListingUtils",
:SweaveListingUtils>  NEWS("SweaveListingUtils")
:SweaveListingUtils>  There is a vignette to this
:SweaveListingUtils>  package; try
:SweaveListingUtils>  vignette("ExampleSweaveListingUtils").


Attaching package: ‘SweaveListingUtils’

The following objects are masked from ‘package:base’:

    library, require

Warning in print.taglist(taglist, LineLength = LineLength, offset.start = nchar(startS),  :
  Some elements of taglist are too long
Warning in kws[idxRec] <- rep(getSweaveListingOption("Recomd.Keywordstyle"),  :
  number of items to replace is not a multiple of replacement length
Warning in methods::show(res$value) :
  arithmetics on distributions are understood as operations on r.v.'s
see 'distrARITH()'; for switching off this warning see '?distroptions'
Warning in methods::show(res$value) :
  arithmetics on distributions are understood as operations on r.v.'s
see 'distrARITH()'; for switching off this warning see '?distroptions'
Warning in .local(.Object, ...) : you have to specify slot r at least

Error: processing vignette ‘distr.Rnw’ failed with diagnostics:
 chunk 8 (label = examdcP) 
Error in (function (classes, fdef, mtable)  : 
  unable to find an inherited method for function ‘r’ for signature ‘"numeric"’
Execution halted