Error(s) in re-building vignettes:
  ...
--- re-building ‘introduction.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 310-314 (introduction.Rmd) 
Error: processing vignette 'introduction.Rmd' failed with diagnostics:
No common type for `..1$dmr$version_nmbr` <double> and `..2$dmr$version_nmbr` <character>.
Backtrace:
     █
  1. ├─tools:::buildVignettes(...)
  2. │ ├─base::tryCatch(...)
  3. │ │ └─base:::tryCatchList(expr, classes, parentenv, handlers)
  4. │ │   └─base:::tryCatchOne(expr, names, parentenv, handlers[[1L]])
  5. │ │     └─base:::doTryCatch(return(expr), name, parentenv, handler)
  6. │ └─engine$weave(file, quiet = quiet, encoding = enc)
  7. │   └─knitr:::vweave(...)
  8. │     └─(if (grepl("\\.[Rr]md$", file)) knit2html_v1 else if (grepl("\\.[Rr]rst$", ...
  9. │       └─knitr::knit2html(..., force_v1 = TRUE)
 10. │         └─knitr::knit(input, text = text, envir = envir, quiet = quiet)
 11. │           └─knitr:::process_file(text, output)
 12. │             ├─base::withCallingHandlers(...)
 13. │             ├─knitr:::process_group(group)
 14. │             └─knitr:::process_group.block(group)
 15. │               └─knitr:::call_block(x)
 16. │                 └─knitr:::block_exec(params)
 17. │                   ├─knitr:::in_dir(...)
 18. │                   └─knitr:::evaluate(...)
 19. │                     └─evaluate::evaluate(...)
 20. │                       └─evaluate:::evaluate_call(...)
 21. │                         ├─evaluate:::timing_fn(...)
 22. │                         ├─base:::handle(...)
 23. │                         ├─base::withCallingHandlers(...)
 24. │                         ├─base::withVisible(eval(expr, envir, enclos))
 25. │                         └─base::eval(expr, envir, enclos)
 26. │                           └─base::eval(expr, envir, enclos)
 27. ├─tidyr::unnest(df)
 28. │ ├─tidyr::unnest(...)
 29. │ └─tidyr:::unnest.data.frame(...)
 30. │   └─tidyr::unchop(data, !!cols, keep_empty = keep_empty, ptype = ptype)
 31. │     └─vctrs::vec_rbind(!!!x, .ptype = ptype)
 32. ├─vctrs:::vec_type2_dispatch(x = x, y = y, x_arg = x_arg, y_arg = y_arg)
 33. ├─vctrs:::vec_ptype2.tbl_df(x = x, y = y, x_arg = x_arg, y_arg = y_arg)
 34. ├─vctrs:::vec_ptype2.tbl_df.data.frame(...)
 35. ├─vctrs:::vec_type2_dispatch(x = x, y = y, x_arg = x_arg, y_arg = y_arg)
 36. ├─vctrs::vec_ptype2.double(x = x, y = y, x_arg = x_arg, y_arg = y_arg)
 37. └─vctrs:::vec_ptype2.double.default(...)
 38.   └─vctrs::vec_default_ptype2(x, y, x_arg = x_arg, y_arg = y_arg)
 39.     └─vctrs::stop_incompatible_type(x, y, x_arg = x_arg, y_arg = y_arg)
 40.       └─vctrs:::stop_incompatible(...)
 41.         └─vctrs:::stop_vctrs(...)
--- failed re-building ‘introduction.Rmd’

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

Error: Vignette re-building failed.
Execution halted