Error(s) in re-building vignettes:
--- re-building ‘Bird_Parasite_CRF.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: glmnet
Loading required package: Matrix
Loaded glmnet 4.1-2
Welcome to MRFcov. If you use the package, please cite as: Clark, NJ, Wells, K and Lindberg, O. 2018. Unravelling changing interspecific interactions across environmental gradients using Markov random fields. Ecology doi: 10.1002/ecy.2221 
Quitting from lines 44-47 (Bird_Parasite_CRF.Rmd) 
Error: processing vignette 'Bird_Parasite_CRF.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Bird_Parasite_CRF.Rmd’

--- re-building ‘CRF_data_prep.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘CRF_data_prep.Rmd’

--- re-building ‘Gaussian_Poisson_CRFs.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
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SUMMARY: processing the following file failed:
  ‘Bird_Parasite_CRF.Rmd’

Error: Vignette re-building failed.
Execution halted