Error(s) in re-building vignettes:
--- re-building 'tramnet.Rnw' using knitr
Loading required package: tram
Loading required package: mlt
Loading required package: basefun
Loading required package: variables
Loading required package: CVXR

Attaching package: 'CVXR'

The following object is masked from 'package:stats':

    power

Loading required package: mlrMBO
Loading required package: mlr
Loading required package: ParamHelpers
Warning message: 'mlr' is in 'maintenance-only' mode since July
2019. Future development will only happen in 'mlr3'
(<https://mlr3.mlr-org.com>). Due to the focus on 'mlr3' there
might be uncaught bugs meanwhile in {mlr} - please consider
switching.
Loading required package: smoof
Loading required package: checkmate
Loading required package: survival
Welcome to penalized. For extended examples, see vignette("penalized").
Loading required package: Matrix
Loaded glmnet 4.1-3

Attaching package: 'coin'

The following object is masked from 'package:CVXR':

    size

The following object is masked from 'package:variables':

    support


warning: solve(): system is singular (rcond: 1.91008e-17); attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular (rcond: 1.92453e-17); attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular (rcond: 1.92453e-17); attempting approx solution

warning: solve(): system is singular; attempting approx solution

warning: solve(): system is singular (rcond: 1.92453e-17); attempting approx solution
Warning in system(paste(shQuote(texi2dvi), if (quiet) "--quiet" else "",  :
  running command '"C:\PROGRA~1\MiKTeX\miktex\bin\x64\texify.exe" --quiet --pdf "tramnet.tex" --max-iterations=20 -I "C:/r_packages/rinst/share/texmf/tex/latex" -I "C:/r_packages/rinst/share/texmf/bibtex/bst"' had status 1
Error: processing vignette 'tramnet.Rnw' failed with diagnostics:
running 'texi2dvi' on 'tramnet.tex' failed

LaTeX errors:
! LaTeX Error: File `tabu.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

tramnet.tex:35:  ==> Fatal error occurred, no output PDF file produced!

--- failed re-building 'tramnet.Rnw'

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

Error: Vignette re-building failed.
Execution halted