Error(s) in re-building vignettes:
  ...
--- re-building ‘bridgesde.Rmd’ using rmarkdown
Warning in knitr::knit(knit_input, knit_output, envir = envir, quiet = quiet,  :
  The file "bridgesde.Rmd" should be encoded in UTF-8. Now I will try to read it with the system native encoding (which may not be correct). We will only support UTF-8 in the near future. Please see https://yihui.name/en/2018/11/biggest-regret-knitr/ for more info.
Warning in grep("\n", x) : input string 33 is invalid in this locale
Warning in grep("\n", x) : input string 73 is invalid in this locale
Warning in grep("\n", x) : input string 290 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 33 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 73 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 290 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 33 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 73 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 290 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 33 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 73 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 290 is invalid in this locale
Package 'Sim.DiffProc', version 4.3
browseVignettes('Sim.DiffProc') for more informations.
--- finished re-building ‘bridgesde.Rmd’

--- re-building ‘fitsde.Rmd’ using rmarkdown
Package 'Sim.DiffProc', version 4.3
browseVignettes('Sim.DiffProc') for more informations.
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
Warning in dnorm(x, mean = x0 + A(t0, x0, theta) * dt, sd = sqrt(dt) * S(t0,  :
  NaNs produced
--- finished re-building ‘fitsde.Rmd’

--- re-building ‘fptsde.Rmd’ using rmarkdown
Package 'Sim.DiffProc', version 4.3
browseVignettes('Sim.DiffProc') for more informations.
--- finished re-building ‘fptsde.Rmd’

--- re-building ‘mcmsde.Rmd’ using rmarkdown
Warning in knitr::knit(knit_input, knit_output, envir = envir, quiet = quiet,  :
  The file "mcmsde.Rmd" should be encoded in UTF-8. Now I will try to read it with the system native encoding (which may not be correct). We will only support UTF-8 in the near future. Please see https://yihui.name/en/2018/11/biggest-regret-knitr/ for more info.
Warning in grep("\n", x) : input string 199 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 199 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 199 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 199 is invalid in this locale
Package 'Sim.DiffProc', version 4.3
browseVignettes('Sim.DiffProc') for more informations.
--- finished re-building ‘mcmsde.Rmd’

--- re-building ‘sdetotex.Rmd’ using rmarkdown
Warning in knitr::knit(knit_input, knit_output, envir = envir, quiet = quiet,  :
  The file "sdetotex.Rmd" should be encoded in UTF-8. Now I will try to read it with the system native encoding (which may not be correct). We will only support UTF-8 in the near future. Please see https://yihui.name/en/2018/11/biggest-regret-knitr/ for more info.
Warning in grep("\n", x) : input string 146 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 146 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 146 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 146 is invalid in this locale
Package 'Sim.DiffProc', version 4.3
browseVignettes('Sim.DiffProc') for more informations.
--- finished re-building ‘sdetotex.Rmd’

--- re-building ‘snssde.Rmd’ using rmarkdown
Warning in knitr::knit(knit_input, knit_output, envir = envir, quiet = quiet,  :
  The file "snssde.Rmd" should be encoded in UTF-8. Now I will try to read it with the system native encoding (which may not be correct). We will only support UTF-8 in the near future. Please see https://yihui.name/en/2018/11/biggest-regret-knitr/ for more info.
Warning in grep("\n", x) : input string 28 is invalid in this locale
Warning in grep("\n", x) : input string 53 is invalid in this locale
Warning in grep("\n", x) : input string 98 is invalid in this locale
Warning in grep("\n", x) : input string 117 is invalid in this locale
Warning in grep("\n", x) : input string 135 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 28 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 53 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 98 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 117 is invalid in this locale
Warning in grep("^(---|\\.\\.\\.)\\s*$", lines) :
  input string 135 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 28 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 53 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 98 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 117 is invalid in this locale
Warning in grepl(chunk.begin, lines) :
  input string 135 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 28 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 53 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 98 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 117 is invalid in this locale
Warning in grepl(chunk.end, lines) :
  input string 135 is invalid in this locale
Package 'Sim.DiffProc', version 4.3
browseVignettes('Sim.DiffProc') for more informations.
Warning in grepl(rc, x) : input string 4 is invalid in this locale
Warning in grepl("^\\s*$", x) :
  input string 4 is invalid in this locale
Warning in grep("\n", x) : input string 4 is invalid in this locale
Quitting from lines 50-57 (snssde.Rmd) 
Error: processing vignette 'snssde.Rmd' failed with diagnostics:
input string 4 is invalid UTF-8
--- failed re-building ‘snssde.Rmd’

SUMMARY: processing the following file failed:
  ‘snssde.Rmd’

Error: Vignette re-building failed.
Execution halted