Error(s) in re-building vignettes:
--- re-building ‘cobalt_A0_basic_use.Rmd’ using rmarkdown
 cobalt (Version 4.0.0, Build Date: 2020-01-08 14:20:10 UTC)
   Please read the documentation at ?bal.tab to understand the default outputs.
   Submit bug reports and feature requests to https://github.com/ngreifer/cobalt/issues
   Install the development version (not guaranteed to be stable) with:
     devtools::install_github("ngreifer/cobalt")
   Thank you for using cobalt!

Attaching package: 'MatchIt'

The following object is masked _by_ '.GlobalEnv':

    lalonde

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

    lalonde

Loading required package: gbm
Loaded gbm 2.1.5
Loading required package: survey
Loading required package: grid
Loading required package: Matrix
Loading required package: survival

Attaching package: 'survey'

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

    dotchart

Loading required package: xtable
Loading required package: lattice
Loading required package: latticeExtra
Warning in ps(f.build("treat", covs0), data = lalonde, stop.method = "es.max",  :
  Optimal number of iterations is close to the specified n.trees. n.trees is likely set too small and better balance might be obtainable by setting n.trees to be larger.
--- finished re-building ‘cobalt_A0_basic_use.Rmd’

--- re-building ‘cobalt_A1_other_packages.Rmd’ using rmarkdown
Loading required package: gbm
Loaded gbm 2.1.5
Loading required package: survey
Loading required package: grid
Loading required package: Matrix
Loading required package: survival

Attaching package: 'survey'

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

    dotchart

Loading required package: xtable
Loading required package: lattice
Loading required package: latticeExtra
Loading required package: MASS
## 
##  Matching (Version 4.9-7, Build Date: 2020-02-05)
##  See http://sekhon.berkeley.edu/matching for additional documentation.
##  Please cite software as:
##   Jasjeet S. Sekhon. 2011. ``Multivariate and Propensity Score Matching
##   Software with Automated Balance Optimization: The Matching package for R.''
##   Journal of Statistical Software, 42(7): 1-52. 
##

The optmatch package has an academic license. Enter relaxinfo() for more information.
Loading required package: MatchIt

Attaching package: 'MatchIt'

The following object is masked _by_ '.GlobalEnv':

    lalonde

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

    lalonde

Loading required package: nnet
Loading required package: numDeriv
Loading required package: glmnet
Loaded glmnet 3.0-2

CBPS: Covariate Balancing Propensity Score
Version: 0.21
Authors: Christian Fong [aut, cre],
  Marc Ratkovic [aut],
  Kosuke Imai [aut],
  Chad Hazlett [ctb],
  Xiaolin Yang [ctb],
  Sida Peng [ctb]

##
## ebal Package: Implements Entropy Balancing.

## See http://www.stanford.edu/~jhain/ for additional information.


Loading required package: slam
Loading required package: Rglpk
Using the GLPK callable library version 4.65

Attaching package: 'designmatch'

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

    ecdfplot

Loading required package: WeightIt

Attaching package: 'mice'

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

    complete, pool

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

    cbind, rbind

Quitting from lines 251-267 (cobalt_A1_other_packages.Rmd) 
Error: processing vignette 'cobalt_A1_other_packages.Rmd' failed with diagnostics:
argument "object" is missing, with no default
--- failed re-building ‘cobalt_A1_other_packages.Rmd’

--- re-building ‘cobalt_A2_segmented_data.Rmd’ using rmarkdown
 cobalt (Version 4.0.0, Build Date: 2020-01-08 14:20:10 UTC)
   Please read the documentation at ?bal.tab to understand the default outputs.
   Submit bug reports and feature requests to https://github.com/ngreifer/cobalt/issues
   Install the development version (not guaranteed to be stable) with:
     devtools::install_github("ngreifer/cobalt")
   Thank you for using cobalt!

Attaching package: 'cobalt'

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

    lalonde

Warning: Standardized mean differences and raw mean differences are present in the same plot. 
Use the 'stars' argument to distinguish between them and appropriately label the x-axis.
Warning: Standardized mean differences and raw mean differences are present in the same plot. 
Use the 'stars' argument to distinguish between them and appropriately label the x-axis.
Warning: Standardized mean differences and raw mean differences are present in the same plot. 
Use the 'stars' argument to distinguish between them and appropriately label the x-axis.
Loading required package: WeightIt

Attaching package: 'mice'

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

    complete, pool

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

    cbind, rbind

Quitting from lines 121-133 (cobalt_A2_segmented_data.Rmd) 
Error: processing vignette 'cobalt_A2_segmented_data.Rmd' failed with diagnostics:
argument "object" is missing, with no default
--- failed re-building ‘cobalt_A2_segmented_data.Rmd’

--- re-building ‘cobalt_A3_longitudinal_treat.Rmd’ using rmarkdown
 cobalt (Version 4.0.0, Build Date: 2020-01-08 14:20:10 UTC)
   Please read the documentation at ?bal.tab to understand the default outputs.
   Submit bug reports and feature requests to https://github.com/ngreifer/cobalt/issues
   Install the development version (not guaranteed to be stable) with:
     devtools::install_github("ngreifer/cobalt")
   Thank you for using cobalt!
--- finished re-building ‘cobalt_A3_longitudinal_treat.Rmd’

--- re-building ‘cobalt_A4_love.plot.Rmd’ using rmarkdown
 cobalt (Version 4.0.0, Build Date: 2020-01-08 14:20:10 UTC)
   Please read the documentation at ?bal.tab to understand the default outputs.
   Submit bug reports and feature requests to https://github.com/ngreifer/cobalt/issues
   Install the development version (not guaranteed to be stable) with:
     devtools::install_github("ngreifer/cobalt")
   Thank you for using cobalt!
--- finished re-building ‘cobalt_A4_love.plot.Rmd’

SUMMARY: processing the following files failed:
  ‘cobalt_A1_other_packages.Rmd’ ‘cobalt_A2_segmented_data.Rmd’

Error: Vignette re-building failed.
Execution halted