Error(s) in re-building vignettes:
--- re-building ‘flexsurvcure.Rmd’ using rmarkdown
Loading required package: survival
Loading required package: flexsurv
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in flexsurvreg(Surv(rectime, censrec) ~ group, data = list(censrec = c(0L,  :
  Optimisation has probably not converged to the maximum likelihood - Hessian is not positive definite. 
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in pweibull(q, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
Warning in dweibull(x, shape = shape, scale = scale^{ : NaNs produced
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'flexsurvcure.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘flexsurvcure.Rmd’

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

Error: Vignette re-building failed.
Execution halted