Error(s) in re-building vignettes:
  ...
--- re-building ‘simmer-01-introduction.Rmd’ using rmarkdown
--- finished re-building ‘simmer-01-introduction.Rmd’

--- re-building ‘simmer-02-jss.Rmd’ using rmarkdown
Warning in .make_numeric_version(x, strict, .standard_regexps()$valid_numeric_version) :
  invalid non-character version specification 'x' (type: double)
Calls:
 1: tools:::.buildOneVignette("simmer-02-jss.Rmd", "/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/simmer.Rcheck/vign_test/simmer", TRUE, FALSE, "simmer-02-jss", "UTF-8", "/home/hornik/tmp/scratch/RtmpmloWPh/filefe3c3116fff73.rds")
 2: tryCatch({
        engine$weave(file, quiet = quiet, encoding = enc)
        setwd(startdir)
        output <- find_vignette_product(name, by = "weave", engine = engine)
        if (!have.makefile && vignette_is_tex(output)) {
            texi2pdf(file = output, clean = FALSE, quiet = quiet)
            output <- find_vignette_product(name, by = "texi2pdf", engine = engine)
        }
    }, error = function(e) {
        OK <<- FALSE
        message(gettextf("Error: processing vignette '%s' failed with diagnostics:\n%s", file, conditionMessage(e)))
    })
 3: tryCatchList(expr, classes, parentenv, handlers)
 4: tryCatchOne(expr, names, parentenv, handlers[[1L]])
 5: doTryCatch(return(ex [... truncated]
Warning in .make_numeric_version(x, strict, .standard_regexps()$valid_numeric_version) :
  invalid non-character version specification 'x' (type: double)
Calls:
 1: tools:::.buildOneVignette("simmer-02-jss.Rmd", "/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/simmer.Rcheck/vign_test/simmer", TRUE, FALSE, "simmer-02-jss", "UTF-8", "/home/hornik/tmp/scratch/RtmpmloWPh/filefe3c3116fff73.rds")
 2: tryCatch({
        engine$weave(file, quiet = quiet, encoding = enc)
        setwd(startdir)
        output <- find_vignette_product(name, by = "weave", engine = engine)
        if (!have.makefile && vignette_is_tex(output)) {
            texi2pdf(file = output, clean = FALSE, quiet = quiet)
            output <- find_vignette_product(name, by = "texi2pdf", engine = engine)
        }
    }, error = function(e) {
        OK <<- FALSE
        message(gettextf("Error: processing vignette '%s' failed with diagnostics:\n%s", file, conditionMessage(e)))
    })
 3: tryCatchList(expr, classes, parentenv, handlers)
 4: tryCatchOne(expr, names, parentenv, handlers[[1L]])
 5: doTryCatch(return(ex [... truncated]
Warning: LaTeX Warning: Label `architecture' multiply defined.
Warning: LaTeX Warning: There were multiply-defined labels.
--- finished re-building ‘simmer-02-jss.Rmd’

--- re-building ‘simmer-03-trajectories.Rmd’ using rmarkdown
--- finished re-building ‘simmer-03-trajectories.Rmd’

--- re-building ‘simmer-04-bank-1.Rmd’ using rmarkdown
--- finished re-building ‘simmer-04-bank-1.Rmd’

--- re-building ‘simmer-04-bank-2.Rmd’ using rmarkdown

Quitting from lines 671-700 [unnamed-chunk-13] (simmer-04-bank-2.Rmd)
Error: processing vignette ‘simmer-04-bank-2.Rmd’ failed with diagnostics:
cannot coerce type 'environment' to vector of type 'double'
--- failed re-building ‘simmer-04-bank-2.Rmd’

--- re-building ‘simmer-05-simpy.Rmd’ using rmarkdown
--- finished re-building ‘simmer-05-simpy.Rmd’

--- re-building ‘simmer-06-queueing.Rmd’ using rmarkdown
--- finished re-building ‘simmer-06-queueing.Rmd’

--- re-building ‘simmer-07-ctmc.Rmd’ using rmarkdown
--- finished re-building ‘simmer-07-ctmc.Rmd’

--- re-building ‘simmer-08-philosophers.Rmd’ using rmarkdown
--- finished re-building ‘simmer-08-philosophers.Rmd’

--- re-building ‘simmer-aa-5G.Rmd’ using rmarkdown
--- finished re-building ‘simmer-aa-5G.Rmd’

SUMMARY: processing the following file failed:
  ‘simmer-04-bank-2.Rmd’

Error: Vignette re-building failed.
Execution halted