Error: Subscript `AMr1.orig` is a matrix, the data `x.imp[, -possibleFactors][AMr1.orig]` must have size 1

[Vincent Arel-Bundock]

In case you had not seen this StackOverflow error report from 2020:

https://stackoverflow.com/questions/64056125/how-to-fix-erreur-subscript-amr1-orig-is-a-matrix-the-data-x-imp-possib

I just ran into the same problem. The solution is simple. Just add this to convert x to data frame if it is a tibble:

if (inherits(x, "tbl_df")) {
  x <- as.data.frame(x)
}

[Vincent Arel-Bundock]

FWIW, I ran into this issue with a complex dataset today. Hard to create a minimal reproducible example, but the SO question and answer have a lot of likes and comments, so I think the bug should be treated as "replicated on several machines."

[M. Emre Coskun]

Ran into this problem recently, and spent an hour trying to understand what was wrong. Fortunately, the SO post helped me resolve it. A bug fix would be helpful.