Error(s) in re-building vignettes:
--- re-building 'c2.formula.data.Rmd' using rmarkdown
Error: processing vignette 'c2.formula.data.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'c2.formula.data.Rmd'

--- re-building 'c3.rum.Rmd' using rmarkdown
Error: processing vignette 'c3.rum.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'c3.rum.Rmd'

--- re-building 'c4.relaxiid.Rmd' using rmarkdown
Error: processing vignette 'c4.relaxiid.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'c4.relaxiid.Rmd'

--- re-building 'c5.mxl.Rmd' using rmarkdown
Error: processing vignette 'c5.mxl.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'c5.mxl.Rmd'

--- re-building 'c6.mprobit.Rmd' using rmarkdown
Error: processing vignette 'c6.mprobit.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'c6.mprobit.Rmd'

--- re-building 'c7.miscmodels.Rmd' using rmarkdown
Error: processing vignette 'c7.miscmodels.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'c7.miscmodels.Rmd'

--- re-building 'c8.conclusion.Rmd' using rmarkdown
Error: processing vignette 'c8.conclusion.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'c8.conclusion.Rmd'

--- re-building 'e1mlogit.Rmd' using rmarkdown
Error: processing vignette 'e1mlogit.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'e1mlogit.Rmd'

--- re-building 'e2nlogit.Rmd' using rmarkdown
Error: processing vignette 'e2nlogit.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'e2nlogit.Rmd'

--- re-building 'e3mxlogit.Rmd' using rmarkdown
Error: processing vignette 'e3mxlogit.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'e3mxlogit.Rmd'

--- re-building 'e4mprobit.Rmd' using rmarkdown
Error: processing vignette 'e4mprobit.Rmd' failed with diagnostics:
DLL 'Rcpp' not found: maybe not installed for this architecture?
--- failed re-building 'e4mprobit.Rmd'

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

SUMMARY: processing the following files failed:
  'c2.formula.data.Rmd' 'c3.rum.Rmd' 'c4.relaxiid.Rmd' 'c5.mxl.Rmd'
  'c6.mprobit.Rmd' 'c7.miscmodels.Rmd' 'c8.conclusion.Rmd'
  'e1mlogit.Rmd' 'e2nlogit.Rmd' 'e3mxlogit.Rmd' 'e4mprobit.Rmd'
  'mlogit.Rmd'

Error: Vignette re-building failed.
Execution halted