could not find function geom_lollipop

It seems that the function "geom_lollipop" is not a standard function in R. It may be part of a specific package or library that needs to be installed and loaded before using the function.

You can try to install and load the "ggalt" package which includes the "geom_lollipop" function using the following commands:

install.packages("ggalt")
library(ggalt)

Once the package is loaded, you should be able to use the "geom_lollipop" function.