starwars

$\backslash$table$[[$name$,$height,mass,gender,species$],[$Luke Skywalker,$172,77\mathrm{.}0,$masculine,Human$],[$R$2-$D$2,96,32\mathrm{.}0,$masculine,Droid$],[$Leia Organa,$150,49\mathrm{.}0,$feminine,Human$],[$Chewbacca$,228,112\mathrm{.}0,$masculine,Wookiee$]]$

Refer to the starwars data set. What kind of error would this code generate?

ggplot$($starwars$,$ aes gender, fill $=$ species