Error(s) in re-building vignettes:
  ...
--- re-building 'c2.formula.data.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
--- finished re-building 'c2.formula.data.Rmd'

--- re-building 'c3.rum.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
Version:  1.36.23
Date:     2017-03-03
Author:   Philip Leifeld (University of Glasgow)

Please cite the JSS article in your publications -- see citation("texreg").
--- finished re-building 'c3.rum.Rmd'

--- re-building 'c4.relaxiid.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
Quitting from lines 196-198 (c4.relaxiid.Rmd) 
Error: processing vignette 'c4.relaxiid.Rmd' failed with diagnostics:
there is no package called 'car'
--- failed re-building 'c4.relaxiid.Rmd'

--- re-building 'c5.mxl.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
Quitting from lines 372-382 (c5.mxl.Rmd) 
Error: processing vignette 'c5.mxl.Rmd' failed with diagnostics:
there is no package called 'car'
--- failed re-building 'c5.mxl.Rmd'

--- re-building 'c6.mprobit.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
--- finished re-building 'c6.mprobit.Rmd'

--- re-building 'c7.miscmodels.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
--- finished re-building 'c7.miscmodels.Rmd'

--- re-building 'e1mlogit.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
--- finished re-building 'e1mlogit.Rmd'

--- re-building 'e2nlogit.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
--- finished re-building 'e2nlogit.Rmd'

--- re-building 'e3mxlogit.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
--- finished re-building 'e3mxlogit.Rmd'

--- re-building 'e4mprobit.Rmd' using rmarkdown
Loading required package: Formula
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmtest
--- finished re-building 'e4mprobit.Rmd'

--- re-building 'mlogit.Rmd' using rmarkdown
[WARNING] This document format requires a nonempty <title> element.
  Defaulting to 'mlogit.utf8' as the title.
  To specify a title, use 'title' in metadata or --metadata title="...".
--- finished re-building 'mlogit.Rmd'

SUMMARY: processing the following files failed:
  'c4.relaxiid.Rmd' 'c5.mxl.Rmd'

Error: Vignette re-building failed.
Execution halted