Error(s) in re-building vignettes:
  ...
--- re-building ‘cvxrPortfolioAnalytics.pdf.asis’ using asis
--- finished re-building ‘cvxrPortfolioAnalytics.pdf.asis’

--- re-building ‘robustCovMatForPA.pdf.asis’ using asis
--- finished re-building ‘robustCovMatForPA.pdf.asis’

--- re-building ‘ROI_vignette.Rnw’ using Sweave
Warning: executing %dopar% sequentially: no parallel backend registered
--- finished re-building ‘ROI_vignette.Rnw’

--- re-building ‘custom_moments_objectives.Rnw’ using Sweave
Loading required package: zoo

Attaching package: ‘zoo’

The following objects are masked from ‘package:base’:

    as.Date, as.Date.numeric

Loading required package: xts
Loading required package: foreach
Loading required package: PerformanceAnalytics

Attaching package: ‘PerformanceAnalytics’

The following object is masked from ‘package:graphics’:

    legend

Registered S3 method overwritten by 'PortfolioAnalytics':
  method           from
  print.constraint ROI 
Loading required package: parallel

DEoptim package
Differential Evolution algorithm in R
Authors: D. Ardia, K. Mullen, B. Peterson and J. Ulrich

Loading required package: MASS
Leverage constraint min_sum and max_sum are restrictive, 
              consider relaxing. e.g. 'full_investment' constraint should be min_sum=0.99 and max_sum=1.01
--- finished re-building ‘custom_moments_objectives.Rnw’

--- re-building ‘portfolio_vignette.Rnw’ using Sweave
Loading required package: zoo

Attaching package: ‘zoo’

The following objects are masked from ‘package:base’:

    as.Date, as.Date.numeric

Loading required package: xts
Loading required package: foreach
Loading required package: PerformanceAnalytics

Attaching package: ‘PerformanceAnalytics’

The following object is masked from ‘package:graphics’:

    legend

Registered S3 method overwritten by 'PortfolioAnalytics':
  method           from
  print.constraint ROI 
Warning: executing %dopar% sequentially: no parallel backend registered
Loading required package: parallel

DEoptim package
Differential Evolution algorithm in R
Authors: D. Ardia, K. Mullen, B. Peterson and J. Ulrich

ROI: R Optimization Infrastructure
Registered solver plugins: nlminb, symphony, glpk, quadprog.
Default solver: auto.

Attaching package: ‘ROI’

The following objects are masked from ‘package:PortfolioAnalytics’:

    is.constraint, objective

Loading required package: ROI.plugin.glpk
Loading required package: ROI.plugin.quadprog
--- finished re-building ‘portfolio_vignette.Rnw’

--- re-building ‘risk_budget_optimization.Rnw’ using Sweave
Loading required package: zoo

Attaching package: ‘zoo’

The following objects are masked from ‘package:base’:

    as.Date, as.Date.numeric

Loading required package: xts
Loading required package: foreach
Loading required package: PerformanceAnalytics

Attaching package: ‘PerformanceAnalytics’

The following object is masked from ‘package:graphics’:

    legend

Registered S3 method overwritten by 'PortfolioAnalytics':
  method           from
  print.constraint ROI 
Loading required package: parallel

DEoptim package
Differential Evolution algorithm in R
Authors: D. Ardia, K. Mullen, B. Peterson and J. Ulrich


Error: processing vignette 'risk_budget_optimization.Rnw' failed with diagnostics:
 chunk 10 
Error in CCCgarch.MM(R, clean = objective$arguments.clean, ...) : 
  "package:fGarch" %in% search() || requireNamespace("fGarch",  .... is not TRUE

--- failed re-building ‘risk_budget_optimization.Rnw’

SUMMARY: processing the following file failed:
  ‘risk_budget_optimization.Rnw’

Error: Vignette re-building failed.
Execution halted