R future multisession Error: values() is defunct in future (>= 1.20.0). Use value() instead

[OscarKjell]

I had a function successfully using future multisession, but with an update of future received the below error, which I have not figured out how to solve:

Error: values() is defunct in future (>= 1.20.0). Use value() instead.

Please see below example (where I am not using values(), but still get the error):

future::plan(future::multisession)

test_function <- function(x){
  x <- x+5
  return(x)
}

test_data <- list(c(1, 2, 3), c(1, 2, 3))

tuning_results <- furrr::future_map(
  .x = test_data,
  .f = test_function)

Thanks in advance

[HenrikBengtsson]

It looks like you're running a version of furrr that is several years old. Updating should fix this.

FYI, you can see that this comes from furrr yourself by calling

traceback()

immediately after getting the error.

[OscarKjell]

Thanks a lot for the solution and for the advice!