Error(s) in re-building vignettes:
  ...
--- re-building ‘glmdisc.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Iteration 1 ended with a performance of aic = -Inf
Iteration 2 ended with a performance of aic = -118.424562341931
Iteration 3 ended with a performance of aic = -129.114204332099
Iteration 4 ended with a performance of aic = -111.826561509232
Iteration 5 ended with a performance of aic = -120.787075461193
Iteration 6 ended with a performance of aic = -106.560488451988
Iteration 7 ended with a performance of aic = -122.991950078008
Iteration 8 ended with a performance of aic = -127.945089154071
Iteration 9 ended with a performance of aic = -132.063976138736
Iteration 10 ended with a performance of aic = -143.170750631673
Iteration 11 ended with a performance of aic = -125.677630561622
Iteration 12 ended with a performance of aic = -133.141856378431
Iteration 13 ended with a performance of aic = -128.346702873331
Iteration 14 ended with a performance of aic = -129.330065520135
Iteration 15 ended with a performance of aic = -129.268461583808
Iteration 16 ended with a performance of aic = -124.872463609901
Iteration 17 ended with a performance of aic = -132.594330826968
Iteration 18 ended with a performance of aic = -146.624896803604
Iteration 19 ended with a performance of aic = -137.488135016677
Iteration 20 ended with a performance of aic = -134.008951680274
Iteration 21 ended with a performance of aic = -134.916220349052
Iteration 22 ended with a performance of aic = -133.857709794807
Iteration 23 ended with a performance of aic = -121.311326754771
Iteration 24 ended with a performance of aic = -130.582909548949
Iteration 25 ended with a performance of aic = -130.615036857838
Quitting from lines 298-301 (glmdisc.Rmd) 
Error: processing vignette 'glmdisc.Rmd' failed with diagnostics:
number of items to replace is not a multiple of replacement length
--- failed re-building ‘glmdisc.Rmd’

SUMMARY: processing the following file failed:
  ‘glmdisc.Rmd’

Error: Vignette re-building failed.
Execution halted