Error(s) in re-building vignettes:
  ...
--- re-building ‘Furniture.Rmd’ using rmarkdown
── Attaching packages ────────────────────────────────── tidyverse 1.2.1 ──
✔ ggplot2 3.1.0       ✔ purrr   0.3.0  
✔ tibble  2.0.1       ✔ dplyr   0.8.0.1
✔ tidyr   0.8.3       ✔ stringr 1.4.0  
✔ readr   1.3.1       ✔ forcats 0.4.0  
── Conflicts ───────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
Using dplyr::group_by() groups: c
Breusch-Pagan Test of Heteroskedasticity suggests `var.equal = FALSE` in t.test() for: b
--- finished re-building ‘Furniture.Rmd’

--- re-building ‘Table1.Rmd’ using rmarkdown
── Attaching packages ────────────────────────────────── tidyverse 1.2.1 ──
✔ ggplot2 3.1.0       ✔ purrr   0.3.0  
✔ tibble  2.0.1       ✔ dplyr   0.8.0.1
✔ tidyr   0.8.3       ✔ stringr 1.4.0  
✔ readr   1.3.1       ✔ forcats 0.4.0  
── Conflicts ───────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
Warning: Factor `d` contains implicit NA, consider using `forcats::fct_explicit_na`
Using dplyr::group_by() groups: d
Warning: Factor `d` contains implicit NA, consider using `forcats::fct_explicit_na`
Warning: Factor `f` contains implicit NA, consider using `forcats::fct_explicit_na`
Using dplyr::group_by() groups: d, f
Warning: Factor `d` contains implicit NA, consider using `forcats::fct_explicit_na`
Warning: Factor `f` contains implicit NA, consider using `forcats::fct_explicit_na`
Warning in table1.data.frame(df, A = factor(ifelse(a > 1, 1, 0)), b, c,  :
  Not all variables have at least 2 unique values. Functionality of the following will be limited:
 -- type = 'condense' will not work
 -- test = TRUE will not work
Quitting from lines 207-211 (Table1.Rmd) 
Error: processing vignette 'Table1.Rmd' failed with diagnostics:
'x' and 'y' must have at least 2 levels
--- failed re-building ‘Table1.Rmd’

SUMMARY: processing the following file failed:
  ‘Table1.Rmd’

Error: Vignette re-building failed.
Execution halted