Error(s) in re-building vignettes:
--- re-building ‘mtram.Rnw’ using knitr
Loading required package: mlt
Loading required package: basefun
Loading required package: variables
Loading required package: survival
Loading required package: tram
Loading required package: lme4
Loading required package: Matrix
Loading required package: gridExtra
Loading required package: lattice
Loading required package: latticeExtra
Loading required package: mvtnorm
Loading required package: ordinalCont
Loading required package: boot

Attaching package: 'boot'

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

    melanoma

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

    aml

Loading required package: splines
Loading required package: Deriv
--- finished re-building ‘mtram.Rnw’

--- re-building ‘tram.Rnw’ using knitr
Loading required package: tram
Loading required package: mlt
Loading required package: basefun
Loading required package: variables
Loading required package: survival
Loading required package: MASS
Loading required package: lattice
Loading required package: mlbench
Loading required package: multcomp
Loading required package: mvtnorm
Loading required package: TH.data

Attaching package: 'TH.data'

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

    geyser

Loading required package: ordinal
Loading required package: colorspace
Loading required package: quantreg
Loading required package: SparseM

Attaching package: 'SparseM'

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

    backsolve

Warning in .recacheSubclasses(def@className, def, env) :
  undefined subclass "numericVector" of class "Mnumeric"; definition not updated

Attaching package: 'quantreg'

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

    untangle.specials

Loading required package: trtf
Loading required package: partykit
Loading required package: grid

Attaching package: 'grid'

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

    unit

Loading required package: libcoin
Loading required package: ATR
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE

warning: solve(): system is singular; attempting approx solution
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE
Warning in model.matrix.box_bases(object = list(iresponse = function (data,  :
  use scale = TRUE in as.basis.formula with sumcontr = TRUE

warning: solve(): system is singular (rcond: 4.90156e-18); attempting approx solution
Quitting from lines 970-976 (tram.Rnw) 
Error: processing vignette 'tram.Rnw' failed with diagnostics:
unused argument (maxit = 10000)
--- failed re-building ‘tram.Rnw’

SUMMARY: processing the following file failed:
  ‘tram.Rnw’

Error: Vignette re-building failed.
Execution halted