Error in re-building vignettes:
  ...
Loading required package: ggplot2
Type crmPackHelp() to open help browser
Type crmPackExample() to open example

Warning in Data(x = c(0.1, 0.5, 1.5, 3, 6, 10, 10, 10), y = c(0, 0, 0, 0,  :
  Used default patient IDs!
Loading required package: dplyr

Attaching package: ‘dplyr’

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

    filter, lag

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

    intersect, setdiff, setequal, union

Loading required package: tidyr
Warning in Data(x = c(25, 50, 50, 75, 100, 100, 225, 300), y = c(0, 0, 0,  :
  Used default patient IDs!
Warning in Data(x = c(25, 50, 50, 75, 100, 100, 225, 300), y = c(0, 0, 0,  :
  Used best guess cohort indices!
Warning: Removed 409 rows containing non-finite values (stat_density).
Warning: Removed 576 rows containing non-finite values (stat_density).
starting httpd help server ... done
Scale for 'x' is already present. Adding another scale for 'x', which will
replace the existing scale.
Warning in Data(...) : Used default patient IDs!
Warning in Data(...) : Used best guess cohort indices!
Note: method with signature ‘Simulations#missing’ chosen for function ‘plot’,
 target signature ‘DualSimulations#missing’.
 "GeneralSimulations#missing" would also be valid
Warning in Data(...) : Used default patient IDs!
Warning in Data(...) : Used best guess cohort indices!
Note: method with signature ‘PseudoSimulations#missing’ chosen for function ‘plot’,
 target signature ‘PseudoDualSimulations#missing’.
 "GeneralSimulations#missing" would also be valid
Error in texi2dvi(file = file, pdf = TRUE, clean = clean, quiet = quiet,  : 
  Running 'texi2dvi' on 'example.tex' failed.
LaTeX errors:
! Package babel Error: Unknown option `UKenglish'. Either you misspelled it
(babel)                or the language definition file UKenglish.ldf was not fo
und.

See the babel package documentation for explanation.
! Package babel Error: You haven't specified a language option.

See the babel package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
Calls: buildVignettes -> texi2pdf -> texi2dvi
Execution halted