Error during `cargo add lvgl`

[jockm]

Fair warning I am very new to rust, but in following the directions, I got to the point where I entered:

cargo add lvgl 

And I got the following error:

error: `cargo add` could not determine which package to modify. Use the `--package` option to specify a package. 
available packages: lvgl, lvgl-sys, lvgl-codegen

Can anyone advise what I should do next?

I am on macOS 14.6.1 (if that matters).