Error(s) in re-building vignettes:
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--- re-building ‘mlt.Rnw’ using knitr
Loading required package: basefun
Loading required package: variables
Loading required package: maxLik
Loading required package: miscTools

Please cite the 'maxLik' package as:
Henningsen, Arne and Toomet, Ott (2011). maxLik: A package for maximum likelihood estimation in R. Computational Statistics 26(3), 443-458. DOI 10.1007/s00180-010-0217-1.

If you have questions, suggestions, or comments regarding the 'maxLik' package, please use a forum or 'tracker' at maxLik's R-Forge site:
https://r-forge.r-project.org/projects/maxlik/
Loading required package: tools

Attaching package: 'flexsurv'

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

    Hgompertz, Hllogis, Hlnorm, Hweibull, dgompertz, dllogis,
    hgompertz, hllogis, hlnorm, hweibull, pgompertz, pllogis,
    qgompertz, qllogis, rgompertz, rllogis


Attaching package: 'grid'

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

    unit

Loading required package: RColorBrewer
Loading required package: mvtnorm
Loading required package: TH.data

Attaching package: 'TH.data'

The following object is masked from 'package:HSAUR3':

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

    geyser

trying URL 'https://zenodo.org/record/17179/files/DVC.tgz'
Content type 'application/octet-stream' length 2292581 bytes (2.2 MB)
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downloaded 2.2 MB

Warning: contrasts dropped from factor R_health
Warning: contrasts dropped from factor R_health
Warning: contrasts dropped from factor R_health
Warning: contrasts dropped from factor R_health

warning: solve(): system seems singular; attempting approx solution
Warning: contrasts dropped from factor R_health
Warning: contrasts dropped from factor R_health
Warning: contrasts dropped from factor R_health
Warning: contrasts dropped from factor R_health
Loading required package: nlme

Attaching package: 'nlme'

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

    coef<-

This is mgcv 1.8-29. For overview type 'help("mgcv-package")'.

Attaching package: 'mgcv'

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

    multinom


Re-fitting to get Hessian


Re-fitting to get Hessian


Re-fitting to get Hessian

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--- failed re-building ‘mlt.Rnw’

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

Error: Vignette re-building failed.
Execution halted