formula(x) is deprecated error

[RAJohansen]

The function extract_lm_cv uses my_formula = as.formula(paste(parameter, "~" ,algorithm)) but when this is passed to the function extract_lm_cv_multi we receive the following error

"Using formula(x) is deprecated when x is a character vector of length > 1.
Consider formula(paste(x, collapse = " ")) instead."

Need to figure out a way to recode extract_lm_cv so that it works for single and multiple independent/dependent variables.