具有少于两个数据点的r组已被删除

我试图在岩石海岸调查中创造一个小提琴情节，暴露与遮蔽。我一直在删除我需要的组。

# Violin plot

P5s <- ggplot(Example_data, aes(x=Species, y=Mean_perc), font="calibri")+
  geom_violin()
P5s

# Violin plot with difference between sheltered and exposed side

P6se <- ggplot(data, aes(x=Species, y=Mean_perc, fill=Location), font="calibri")+
  geom_violin()+
  scale_fill_discrete(labels=c("Exposed","Sheltered"))+
  theme(axis.text.x = element_text(angle=90, vjust= 0.5))
P6se

我有我的数据集：https://1drv.ms/x/s!AMCS5WKDAJIBHGHQGXCBZISNQKH？e=TFR7ZA