Error(s) in re-building vignettes:
  ...
--- re-building ‘milr-intro.Rmd’ using rmarkdown
Use the user-defined lambda vector.
Using the criterion BIC to choose optimized penalty.
The chosen penalty throuth BIC is 3.6867.
The penalty term is selected automatically with 50 candidates.
Using the criterion BIC to choose optimized penalty.
The chosen penalty throuth BIC is 4.9895.
The penalty term is selected automatically with 50 candidates.
Using the criterion deviance to choose optimized penalty.
The chosen penalty throuth deviance is 2.8390.
trying URL ‘http://www.cs.columbia.edu/~andrews/mil/data/MIL-Data-2002-Musk-Corel-Trec9.tgz’
Content type 'application/x-gzip' length 6249673 bytes (6.0 MB)
==================================================
downloaded 6.0 MB

Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Warning: 'switch' is deprecated.
Use 'strip.position' instead.
See help("Deprecated")
The penalty term is selected automatically with 100 candidates.
Using the criterion deviance to choose optimized penalty.
The chosen penalty throuth deviance is 3.2909.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
Use the user-defined lambda vector.
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 'milr-intro.Rmd' failed with diagnostics:
pandoc document conversion failed with error 83
--- failed re-building ‘milr-intro.Rmd’

SUMMARY: processing the following file failed:
  ‘milr-intro.Rmd’

Error: Vignette re-building failed.
Execution halted