levels
Code
nest(-1L)
Error <simpleError>
`levels` must be greater than or equal to 0.
Code
nest(NA_integer_)
Error <simpleError>
`levels` must be a `character` or an `integer(1)` greater than or equal to 0.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.