TidyModels Best_Tune - Retrieve Best

when I run in shiny:

b <- res %>% best_tune() I get back the best roc_auc set of parameters from my res resamples:

A tibble: 1 × 4

trees min_n sample_size .config

1 1 2 0.1 Preprocessor1_Model1

when I run:
b<- <- res %>% best_tune("roc_auc") I get an error:
Warning: Error in get_metric_direction: Please check the value of metric.

"roc_auc" is a metric in res, so why doesn't best_tune("roc_auc") find the best parameters as best_tune()?


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