Error(s) in re-building vignettes:
  ...
--- re-building ‘aov.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'aov.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘aov.Rmd’

--- re-building ‘betareg.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'betareg.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘betareg.Rmd’

--- re-building ‘binomial.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'binomial.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘binomial.Rmd’

--- re-building ‘continuous.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'continuous.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘continuous.Rmd’

--- re-building ‘count.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'count.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘count.Rmd’

--- re-building ‘glmer.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'glmer.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘glmer.Rmd’

--- re-building ‘jm.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'jm.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘jm.Rmd’

--- re-building ‘lm.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'lm.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘lm.Rmd’

--- re-building ‘polr.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'polr.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘polr.Rmd’

--- re-building ‘pooling.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.
Quitting from lines 17-30 (pooling.Rmd) 
Error: processing vignette 'pooling.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘pooling.Rmd’

--- re-building ‘priors.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'priors.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘priors.Rmd’

--- re-building ‘rstanarm.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.
Quitting from lines 2-15 (./children/SETTINGS-knitr.txt) 
Quitting from lines NA-15 (./children/SETTINGS-knitr.txt) 
Error: processing vignette 'rstanarm.Rmd' failed with diagnostics:
object 'params' not found
--- failed re-building ‘rstanarm.Rmd’

SUMMARY: processing the following files failed:
  ‘aov.Rmd’ ‘betareg.Rmd’ ‘binomial.Rmd’ ‘continuous.Rmd’ ‘count.Rmd’
  ‘glmer.Rmd’ ‘jm.Rmd’ ‘lm.Rmd’ ‘polr.Rmd’ ‘pooling.Rmd’ ‘priors.Rmd’
  ‘rstanarm.Rmd’

Error: Vignette re-building failed.
Execution halted