Error(s) in re-building vignettes:
  ...
--- re-building ‘distrMod.Rnw’ using Sweave
Loading required package: distr
Loading required package: startupmsg
:startupmsg>  *** Utilities for Start-Up Messages ***
:startupmsg> 
:startupmsg>  Version information in start-up messages is
:startupmsg>  currently suppressed. To see such information on
:startupmsg>  startup as in versions of this pkg prior to this
:startupmsg>  versionr, set option "StartupBanner" to a value
:startupmsg>  different to {"off", "no-version", "no -
:startupmsg>  version"}, e.g., by options("StartupBanner" =
:startupmsg>  "complete") or by options("StartupBanner" = NULL)
:startupmsg>  or by options("StartupBanner" = "something else").
:startupmsg> 
:startupmsg>  Detailed information about which packages are
:startupmsg>  currently loaded or attached at which version
:startupmsg>  (regardless of whether these have start-up
:startupmsg>  messages managed by this package) can be obtained
:startupmsg>  by "sessionInfo()".
:startupmsg> 
:startupmsg> 
Loading required package: sfsmisc
:distr>  *** Object Oriented Implementation of Distributions ***
:distr> 
:distr> 

Attaching package: ‘distr’

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

    df, qqplot, sd

Loading required package: distrEx
:distrEx>  *** Extensions of Package 'distr' ***
:distrEx> 
:distrEx> 

Attaching package: ‘distrEx’

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

    IQR, mad, median, var

Loading required package: RandVar
:RandVar>  *** Implementation of Random Variables ***
:RandVar> 
:RandVar> 
Loading required package: MASS
Loading required package: stats4
:distrMod>  *** Object Oriented Implementation of Probability
:distrMod>  Models ***
:distrMod> 
:distrMod> 

Attaching package: ‘distrMod’

The following object is masked from ‘package:stats4’:

    confint

The following object is masked from ‘package:stats’:

    confint

The following object is masked from ‘package:base’:

    norm

Warning in show(x) :
  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 show(x) :
  arithmetics on distributions are understood as operations on r.v.'s
see 'distrARITH()'; for switching off this warning see '?distroptions'
Error: processing vignette 'distrMod.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'distrMod.tex' failed.
LaTeX errors:
! Undefined control sequence.
<argument> cite.\@citeb 
                        \@extra@b@citeb 
l.87 \begin{document}
                     
! Emergency stop.
<argument> cite.\@citeb 
                        \@extra@b@citeb 
l.87 \begin{document}
                     
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building 'distrMod.Rnw'

SUMMARY: processing the following file failed:
  'distrMod.Rnw'

Error: Vignette re-building failed.
Execution halted