Error(s) in re-building vignettes:
--- re-building 'faq.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union


Attaching package: 'tsibble'

The following object is masked from 'package:dplyr':

    id


Attaching package: 'lubridate'

The following object is masked from 'package:tsibble':

    interval

The following objects are masked from 'package:base':

    date, intersect, setdiff, union

Quitting from lines 62-73 (faq.Rmd) 
Error: processing vignette 'faq.Rmd' failed with diagnostics:
`vars` must be a character vector.
--- failed re-building 'faq.Rmd'

--- re-building 'implicit-na.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union


Attaching package: 'tsibble'

The following object is masked from 'package:dplyr':

    id

--- finished re-building 'implicit-na.Rmd'

--- re-building 'intro-tsibble.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union


Attaching package: 'lubridate'

The following objects are masked from 'package:base':

    date, intersect, setdiff, union


Attaching package: 'tsibble'

The following object is masked from 'package:lubridate':

    interval

The following object is masked from 'package:dplyr':

    id

Warning: The `add` argument of `group_by()` is deprecated as of dplyr 1.0.0.
Please use the `.add` argument instead.
This warning is displayed once every 8 hours.
Call `lifecycle::last_warnings()` to see where this warning was generated.
`summarise()` regrouping output by 'origin' (override with `.groups` argument)
--- finished re-building 'intro-tsibble.Rmd'

--- re-building 'window.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union


Attaching package: 'tsibble'

The following object is masked from 'package:dplyr':

    id

--- finished re-building 'window.Rmd'

SUMMARY: processing the following file failed:
  'faq.Rmd'

Error: Vignette re-building failed.
Execution halted