Throw appropriate error when package cannot be tuned

[cimentadaj]

library(tidymodels)
#> ── Attaching packages ───────────────────────────────── tidymodels 0.1.1.9000 ──
#> ✔ broom     0.7.0          ✔ recipes   0.1.13    
#> ✔ dials     0.0.8          ✔ rsample   0.0.7.9000
#> ✔ dplyr     1.0.2          ✔ tibble    3.0.3.9000
#> ✔ ggplot2   3.3.2          ✔ tidyr     1.1.1     
#> ✔ infer     0.5.3          ✔ tune      0.1.1.9000
#> ✔ modeldata 0.0.2          ✔ workflows 0.1.3.9000
#> ✔ parsnip   0.1.3.9000     ✔ yardstick 0.0.7     
#> ✔ purrr     0.3.4
#> ── Conflicts ───────────────────────────────────────── tidymodels_conflicts() ──
#> ✖ purrr::discard() masks scales::discard()
#> ✖ dplyr::filter()  masks stats::filter()
#> ✖ dplyr::lag()     masks stats::lag()
#> ✖ recipes::step()  masks stats::step()
library(tidyflow)
#> 
#> Attaching package: 'tidyflow'
#> The following object is masked from 'package:tune':
#> 
#>     parameters
#> The following object is masked from 'package:dials':
#> 
#>     parameters

mod <- logistic_reg(penalty = tune(), mixture = tune()) %>% set_engine("glm")

tflow <-
  mtcars %>%
  mutate(am = as.factor(am)) %>% 
  tidyflow(seed = 5131) %>%
  plug_formula(am ~ .) %>%
  plug_resample(vfold_cv) %>%
  plug_grid(grid_regular) %>% 
  plug_model(mod)

fit(tflow)
#> Error: At least one parameter object is required.

This is because I got confused using glm instead of glmnet. Shouldn't this error be delegated to tune or something?