Error(s) in re-building vignettes:
--- re-building 'cobalt_A0_basic_use.Rmd' using rmarkdown
 cobalt (Version 4.2.0, Build Date: 2020-06-04 08:00:06 UTC)
Quitting from lines 111-121 (cobalt_A0_basic_use.Rmd) 
Error: processing vignette 'cobalt_A0_basic_use.Rmd' failed with diagnostics:
could not find function "deparse1"
--- failed re-building 'cobalt_A0_basic_use.Rmd'

--- re-building 'cobalt_A1_other_packages.Rmd' using rmarkdown
Quitting from lines 32-35 (cobalt_A1_other_packages.Rmd) 
Error: processing vignette 'cobalt_A1_other_packages.Rmd' failed with diagnostics:
could not find function "deparse1"
--- failed re-building 'cobalt_A1_other_packages.Rmd'

--- re-building 'cobalt_A2_segmented_data.Rmd' using rmarkdown
 cobalt (Version 4.2.0, Build Date: 2020-06-04 08:00:06 UTC)

Attaching package: 'cobalt'

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

    lalonde

Quitting from lines 60-61 (cobalt_A2_segmented_data.Rmd) 
Error: processing vignette 'cobalt_A2_segmented_data.Rmd' failed with diagnostics:
could not find function "deparse1"
--- failed re-building 'cobalt_A2_segmented_data.Rmd'

--- re-building 'cobalt_A3_longitudinal_treat.Rmd' using rmarkdown
 cobalt (Version 4.2.0, Build Date: 2020-06-04 08:00:06 UTC)
Quitting from lines 62-66 (cobalt_A3_longitudinal_treat.Rmd) 
Error: processing vignette 'cobalt_A3_longitudinal_treat.Rmd' failed with diagnostics:
could not find function "deparse1"
--- failed re-building 'cobalt_A3_longitudinal_treat.Rmd'

--- re-building 'cobalt_A4_love.plot.Rmd' using rmarkdown
 cobalt (Version 4.2.0, Build Date: 2020-06-04 08:00:06 UTC)
Quitting from lines 39-40 (cobalt_A4_love.plot.Rmd) 
Error: processing vignette 'cobalt_A4_love.plot.Rmd' failed with diagnostics:
could not find function "deparse1"
--- failed re-building 'cobalt_A4_love.plot.Rmd'

SUMMARY: processing the following files failed:
  'cobalt_A0_basic_use.Rmd' 'cobalt_A1_other_packages.Rmd'
  'cobalt_A2_segmented_data.Rmd' 'cobalt_A3_longitudinal_treat.Rmd'
  'cobalt_A4_love.plot.Rmd'

Error: Vignette re-building failed.
Execution halted