Error(s) in re-building vignettes:
--- re-building ‘bi-objective_2x.Rmd’ using rmarkdown
Warning: ggrepel: 70 unlabeled data points (too many overlaps). Consider increasing max.overlaps
Warning: ggrepel: 70 unlabeled data points (too many overlaps). Consider increasing max.overlaps
Warning: ggrepel: 70 unlabeled data points (too many overlaps). Consider increasing max.overlaps
Warning: ggrepel: 70 unlabeled data points (too many overlaps). Consider increasing max.overlaps
--- finished re-building ‘bi-objective_2x.Rmd’

--- re-building ‘bi-objective_3x_ex1.Rmd’ using rmarkdown
--- finished re-building ‘bi-objective_3x_ex1.Rmd’

--- re-building ‘intro.Rmd’ using rmarkdown
--- finished re-building ‘intro.Rmd’

--- re-building ‘polytope_2d.Rmd’ using rmarkdown
Quitting from lines 26-27 (polytope_2d.Rmd) 
Error: processing vignette 'polytope_2d.Rmd' failed with diagnostics:
package or namespace load failed for 'gMOIP' in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called 'shiny'
--- failed re-building ‘polytope_2d.Rmd’

--- re-building ‘polytope_3d_ex1.Rmd’ using rmarkdown
Quitting from lines 13-24 (polytope_3d_ex1.Rmd) 
Error: processing vignette 'polytope_3d_ex1.Rmd' failed with diagnostics:
package or namespace load failed for 'rgl' in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called 'shiny'
--- failed re-building ‘polytope_3d_ex1.Rmd’

--- re-building ‘tri-objective.Rmd’ using rmarkdown
Quitting from lines 15-29 (tri-objective.Rmd) 
Error: processing vignette 'tri-objective.Rmd' failed with diagnostics:
package or namespace load failed for 'rgl' in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called 'shiny'
--- failed re-building ‘tri-objective.Rmd’

SUMMARY: processing the following files failed:
  ‘polytope_2d.Rmd’ ‘polytope_3d_ex1.Rmd’ ‘tri-objective.Rmd’

Error: Vignette re-building failed.
Execution halted