Unable to use package

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Hello! Thank you for putting out the guides for generative art using R. I found this library from https://art.djnavarro.net/gallery/native-flora/

I was trying to use the package based on the information available at https://flametree.djnavarro.net/articles/articles/getting-started.html, after installing the library, I loaded it with library(flametree) and then ran flametree_grow() %>% flametree_plot(), I get the error,

Error in flametree:::grow_sapling() %>% flametree:::grow_tree(param) %>%  : 
  object 'shape_tree' not found

Am I missing something?