Error(s) in re-building vignettes:
--- re-building 'Comparison.Rmd' using rmarkdown
Error: processing vignette 'Comparison.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'Comparison.Rmd'

--- re-building 'ErrorEuler.Rmd' using rmarkdown
Error: processing vignette 'ErrorEuler.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'ErrorEuler.Rmd'

--- re-building 'FallingParticle.Rmd' using rmarkdown
Error: processing vignette 'FallingParticle.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'FallingParticle.Rmd'

--- re-building 'Kepler.Rmd' using rmarkdown
Error: processing vignette 'Kepler.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'Kepler.Rmd'

--- re-building 'Muskat-MBal.Rmd' using rmarkdown
Error: processing vignette 'Muskat-MBal.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'Muskat-MBal.Rmd'

--- re-building 'Pendulum.Rmd' using rmarkdown
Error: processing vignette 'Pendulum.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'Pendulum.Rmd'

--- re-building 'Planet.Rmd' using rmarkdown
Error: processing vignette 'Planet.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'Planet.Rmd'

--- re-building 'Projectile.Rmd' using rmarkdown
Error: processing vignette 'Projectile.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'Projectile.Rmd'

--- re-building 'Reaction.Rmd' using rmarkdown
Error: processing vignette 'Reaction.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'Reaction.Rmd'

SUMMARY: processing the following files failed:
  'Comparison.Rmd' 'ErrorEuler.Rmd' 'FallingParticle.Rmd' 'Kepler.Rmd'
  'Muskat-MBal.Rmd' 'Pendulum.Rmd' 'Planet.Rmd' 'Projectile.Rmd'
  'Reaction.Rmd'

Error: Vignette re-building failed.
Execution halted