Error(s) in re-building vignettes:
  ...
--- re-building ‘sandwich-CL.Rnw’ using Sweave
Loading required package: geepack
Loading required package: lattice
Loading required package: lme4
Loading required package: Matrix
Loading required package: lmtest
Loading required package: zoo

Attaching package: ‘zoo’

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

    as.Date, as.Date.numeric

Loading required package: multiwayvcov
Loading required package: pcse

Attaching package: ‘pcse’

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

    vcovPC

Loading required package: plm
Loading required package: pscl
Classes and Methods for R originally developed in the
Political Science Computational Laboratory
Department of Political Science
Stanford University (2002-2015),
by and under the direction of Simon Jackman.
hurdle and zeroinfl functions by Achim Zeileis.
Error: processing vignette 'sandwich-CL.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'sandwich-CL.tex' failed.
LaTeX errors:
! Undefined control sequence.
<argument> cite.\@citeb 
                        \@extra@b@citeb 
l.71 \begin{document}
                     
! Emergency stop.
<argument> cite.\@citeb 
                        \@extra@b@citeb 
l.71 \begin{document}
                     
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘sandwich-CL.Rnw’

--- re-building ‘sandwich-OOP.Rnw’ using Sweave
Loading required package: AER
Loading required package: car
Loading required package: carData
Loading required package: lmtest
Loading required package: zoo

Attaching package: ‘zoo’

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

    as.Date, as.Date.numeric

Loading required package: sandwich
Loading required package: survival
Loading required package: MASS
Error: processing vignette 'sandwich-OOP.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'sandwich-OOP.tex' failed.
LaTeX errors:
! Undefined control sequence.
<argument> cite.\@citeb 
                        \@extra@b@citeb 
l.46 \begin{document}
                     
! Emergency stop.
<argument> cite.\@citeb 
                        \@extra@b@citeb 
l.46 \begin{document}
                     
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘sandwich-OOP.Rnw’

--- re-building ‘sandwich.Rnw’ using Sweave

Attaching package: ‘zoo’

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

    as.Date, as.Date.numeric

Loading required package: strucchange
Loading required package: lmtest
Loading required package: scatterplot3d
Error: processing vignette 'sandwich.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'sandwich.tex' failed.
LaTeX errors:
! Undefined control sequence.
<argument> cite.\@citeb 
                        \@extra@b@citeb 
l.52 \begin{document}
                     
! Emergency stop.
<argument> cite.\@citeb 
                        \@extra@b@citeb 
l.52 \begin{document}
                     
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘sandwich.Rnw’

SUMMARY: processing the following files failed:
  ‘sandwich-CL.Rnw’ ‘sandwich-OOP.Rnw’ ‘sandwich.Rnw’

Error: Vignette re-building failed.
Execution halted