Error(s) in re-building vignettes:
  ...
--- re-building ‘intro.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 88-100 (intro.Rmd) 
Error: processing vignette 'intro.Rmd' failed with diagnostics:
Column name `updated` must not be duplicated.
Use .name_repair to specify repair.
Backtrace:
     █
  1. ├─tools:::buildVignettes(...)
  2. │ ├─base::tryCatch(...)
  3. │ │ └─base:::tryCatchList(expr, classes, parentenv, handlers)
  4. │ │   └─base:::tryCatchOne(expr, names, parentenv, handlers[[1L]])
  5. │ │     └─base:::doTryCatch(return(expr), name, parentenv, handler)
  6. │ └─engine$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. └─`%>%`(...)
 28.   ├─base::withVisible(eval(quote(`_fseq`(`_lhs`)), env, env))
 29.   └─base::eval(quote(`_fseq`(`_lhs`)), env, env)
 30.     └─base::eval(quote(`_fseq`(`_lhs`)), env, env)
 31.       └─`_fseq`(`_lhs`)
 32.         └─magrittr::freduce(value, `_function_list`)
 33.           └─function_list[[i]](value)
 34.             ├─tidyr::unnest(., oa_locations)
 35.             └─tidyr:::unnest.data.frame(., oa_locations)
 36.               └─tidyr::unpack(data, !!cols, names_sep = names_sep, names_repair = names_repair)
 37.                 ├─tibble::as_tibble(out, .name_repair = names_repair)
 38.                 └─tibble:::as_tibble.list(out, .name_repair = names_repair)
 39.                   └─tibble:::lst_to_tibble(x, .rows, .name_repair, col_lengths(x))
 40.                     └─tibble:::set_repaired_names(x, .name_repair)
 41.                       ├─rlang::set_names(x, repaired_names(names(x), .name_repair = .name_repair))
 42.                       │ └─rlang:::set_names_impl(x, x, nm, ...)
 43.                       │   └─rlang::is_function(nm)
 44.                       │     └─rlang::is_closure(x)
 45.                       └─tibble:::repaired_names(names(x), .name_repair = .name_repair)
 46.                         └─tibble:::check_unique(new_name)
--- failed re-building ‘intro.Rmd’

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

Error: Vignette re-building failed.
Execution halted