prep_data impute doesn't work with numeric_method = knnimpute

[NateGarrettHC]

The following code is an example of prep_data not working for knnimpute:
test <- prep_data(d,
outcome=atherosclerosis,
impute=list(numeric_method="knnimpute"))

Here is the error:
Error in gower_work(x = x, y = y, pair_x = pair_x, pair_y = pair_y, n = n, :
STRING_ELT() can only be applied to a 'character vector', not a 'integer'

numeric_method="bagimpute" or "mean" work properly.

[glenrs]

@NateGarrettHC thanks for this issue!

I filed this issue for recipes. The problem lies in their library. I have found that recipes::step_knnimpute fails when character columns are provided instead of factor columns. As a short term solution, please convert your columns to factor columns. We will be issuing this as a warning until recipes fixes this issue.