Error(s) in re-building vignettes:
  ...
--- re-building ‘colorSpec-guide.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 'colorSpec-guide.Rmd' failed with diagnostics:
pandoc document conversion failed with error 83
--- failed re-building ‘colorSpec-guide.Rmd’

--- re-building ‘phenolred.Rmd’ using rmarkdown
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix

Attaching package: 'spacesRGB'

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

    RGBfromXYZ, metadata, metadata<-

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 'phenolred.Rmd' failed with diagnostics:
pandoc document conversion failed with error 83
--- failed re-building ‘phenolred.Rmd’

--- re-building ‘photoncounting.Rmd’ using rmarkdown
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix
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 'photoncounting.Rmd' failed with diagnostics:
pandoc document conversion failed with error 83
--- failed re-building ‘photoncounting.Rmd’

--- re-building ‘blueflame.rnw’ using knitr
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix

Attaching package: 'spacesRGB'

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

    RGBfromXYZ, metadata, metadata<-

--- finished re-building ‘blueflame.rnw’

--- re-building ‘convexity.rnw’ using knitr
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix
--- finished re-building ‘convexity.rnw’

--- re-building ‘emulation.rnw’ using knitr
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix

Attaching package: 'spacesRGB'

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

    RGBfromXYZ, metadata, metadata<-

14:15:55.420 WARN  colorSpec::product.colorSpec(). The returned matrix is ambiguous; because it depends on the splitting. Inspect the matrix carefully. 
14:15:55.440 WARN  colorSpec::product.colorSpec(). The returned matrix is ambiguous; because it depends on the splitting. Inspect the matrix carefully. 
--- finished re-building ‘emulation.rnw’

--- re-building ‘gallery.rnw’ using knitr
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix

Attaching package: 'spacesRGB'

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

    RGBfromXYZ, metadata, metadata<-

--- finished re-building ‘gallery.rnw’

--- re-building ‘inversion.rnw’ using knitr
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix
--- finished re-building ‘inversion.rnw’

--- re-building ‘lens-aging.rnw’ using knitr
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix

Attaching package: 'spacesRGB'

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

    RGBfromXYZ, metadata, metadata<-

--- finished re-building ‘lens-aging.rnw’

--- re-building ‘optimals.rnw’ using knitr
This is colorSpec.  Version: 1.2-1.  Author: Glenn Davis [aut, cre].  Built: R 4.0.2; ; 2020-06-15 05:26:59 UTC; unix
--- finished re-building ‘optimals.rnw’

SUMMARY: processing the following files failed:
  ‘colorSpec-guide.Rmd’ ‘phenolred.Rmd’ ‘photoncounting.Rmd’

Error: Vignette re-building failed.
Execution halted