You are missing the .x argument. You want to map over something (such as the list of column names). Perhaps provide an example dataset to make it clearer.
A minimal reproducible example consists of the following items:
A minimal dataset, necessary to reproduce the issue
The minimal runnable code necessary to reproduce the issue, which can be run
on the given dataset, and including the necessary information on the used packages.
Let's quickly go over each one of these with examples:
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