`setdiff` results in error

[eutwt]

Using setdiff causes an error

library(dplyr, warn.conflicts = FALSE)
library(data.table, warn.conflicts = FALSE)
a <- data.table(x = 1:2)
b <- data.table(x = 2)
setdiff(a, b)
#>    x
#> 1: 1

library(dtplyr, warn.conflicts = FALSE)
setdiff(a, b)
#> Error in step_set(x, y, style = "setdiff"): is_step(y) is not TRUE

^{Created on 2021-08-09 by the reprex package (v2.0.1)}

[markfairbanks]

@eutwt All set

library(dplyr, warn.conflicts = FALSE)
library(data.table, warn.conflicts = FALSE)
library(dtplyr, warn.conflicts = FALSE)

a <- data.table(x = 1:2)
b <- data.table(x = 2)
setdiff(a, b)
#> Source: local data table [1 x 1]
#> Call:   fsetdiff(`_DT1`, `_DT2`)
#> 
#>       x
#>   <int>
#> 1     1
#> 
#> # Use as.data.table()/as.data.frame()/as_tibble() to access results

[eutwt]

Awesome thanks!