Error(s) in re-building vignettes:
--- re-building ‘Introduction.Rmd’ using rmarkdown

Attaching package: 'dplyr'

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

    filter, lag

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

    intersect, setdiff, setequal, union

ROI: R Optimization Infrastructure
Registered solver plugins: nlminb, ecos, alabama, deoptimr, deoptim, glpk, lpsolve, msbinlp, neos, nloptr.bobyqa, nloptr.crs2lm, nloptr.direct, nloptr.directL, nloptr.lbfgs, nloptr.neldermead, nloptr.newuoa, nloptr.sbplx, nloptr.stogo, nloptr.tnewton, nloptr.varmetric, nloptr.cobyla, nloptr.mma, nloptr.auglag, nloptr.isres, nloptr.slsqp, optimx, qpoases, quadprog, scs.
Default solver: auto.
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'Introduction.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Introduction.Rmd’

--- re-building ‘Multi-Objective_Optimization_case_study.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'Multi-Objective_Optimization_case_study.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Multi-Objective_Optimization_case_study.Rmd’

--- re-building ‘Tutorial.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'Tutorial.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Tutorial.Rmd’

SUMMARY: processing the following files failed:
  ‘Introduction.Rmd’ ‘Multi-Objective_Optimization_case_study.Rmd’
  ‘Tutorial.Rmd’

Error: Vignette re-building failed.
Execution halted