Error(s) in re-building vignettes:
--- re-building ‘IPD-meta-analysis.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
Quitting from lines 48-54 (IPD-meta-analysis.Rmd) 
Error: processing vignette 'IPD-meta-analysis.Rmd' failed with diagnostics:
.onLoad failed in loadNamespace() for 'rjags', details:
  call: dyn.load(file, DLLpath = DLLpath, ...)
  error: unable to load shared object '/Volumes/Builds/packages/high-sierra-x86_64/Rlib/4.1/rjags/libs/rjags.so':
  dlopen(/Volumes/Builds/packages/high-sierra-x86_64/Rlib/4.1/rjags/libs/rjags.so, 10): Library not loaded: /usr/local/lib/libjags.4.dylib
  Referenced from: /Volumes/Builds/packages/high-sierra-x86_64/Rlib/4.1/rjags/libs/rjags.so
  Reason: image not found
--- failed re-building ‘IPD-meta-analysis.Rmd’

--- re-building ‘Imputing-missing-values-in-IPD.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.

Attaching package: 'mice'

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

    filter

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

    cbind, rbind

* miceadds 3.11-6 (2021-01-21 11:48:47)
boundary (singular) fit: see help('isSingular')
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boundary (singular) fit: see help('isSingular')
boundary (singular) fit: see help('isSingular')
boundary (singular) fit: see help('isSingular')
boundary (singular) fit: see help('isSingular')
--- finished re-building ‘Imputing-missing-values-in-IPD.Rmd’

SUMMARY: processing the following file failed:
  ‘IPD-meta-analysis.Rmd’

Error: Vignette re-building failed.
Execution halted