Error(s) in re-building vignettes:
  ...
--- re-building ‘defs-and-eqns.Rmd’ using rmarkdown
pandoc-citeproc: Error in $: Incompatible API versions: encoded with [1,20] but attempted to decode with [1,17,5,4].
CallStack (from HasCallStack):
  error, called at ./Text/Pandoc/JSON.hs:111:48 in pandoc-types-1.17.5.4-5tHZ3B61A58JaKOMxwGQR4:Text.Pandoc.JSON
Error running filter /usr/bin/pandoc-citeproc:
Filter returned error status 1
Error: processing vignette 'defs-and-eqns.Rmd' failed with diagnostics:
pandoc document conversion failed with error 83
--- failed re-building ‘defs-and-eqns.Rmd’

--- re-building ‘epiphy.Rmd’ using rmarkdown
Warning in chisq.test2(freq$observed, freq$random, n_est = n_est[["random"]],  :
  Chi-squared approximation may be incorrect.
Warning in chisq.test2(freq$observed, freq$aggregated, n_est = n_est[["aggregated"]],  :
  Chi-squared approximation may be incorrect.
Warning in chisq.test2(freq$observed, freq$random, n_est = n_est[["random"]],  :
  Chi-squared approximation may be incorrect.
Warning in chisq.test2(freq$observed, freq$aggregated, n_est = n_est[["aggregated"]],  :
  Chi-squared approximation may be incorrect.
Warning in chisq.test2(freq$observed, freq$random, n_est = n_est[["random"]],  :
  Chi-squared approximation may be incorrect.
Warning in chisq.test2(freq$observed, freq$aggregated, n_est = n_est[["aggregated"]],  :
  Chi-squared approximation may be incorrect.
Warning in clump.intensity(., unit_size = c(x = 3, y = 3)) :
  To get even clumps of individuals, a total of 54 source sampling units were dropped.
pandoc-citeproc: Error in $: Incompatible API versions: encoded with [1,20] but attempted to decode with [1,17,5,4].
CallStack (from HasCallStack):
  error, called at ./Text/Pandoc/JSON.hs:111:48 in pandoc-types-1.17.5.4-5tHZ3B61A58JaKOMxwGQR4:Text.Pandoc.JSON
Error running filter /usr/bin/pandoc-citeproc:
Filter returned error status 1
Error: processing vignette 'epiphy.Rmd' failed with diagnostics:
pandoc document conversion failed with error 83
--- failed re-building ‘epiphy.Rmd’

SUMMARY: processing the following files failed:
  ‘defs-and-eqns.Rmd’ ‘epiphy.Rmd’

Error: Vignette re-building failed.
Execution halted